B8.5 s4 downpipe install

[riseabv]

So we have all been anxiously waiting to upgrade these 3.0t platforms to extract power. Well my local boutique shop developed a set of catless downpipes(cat bypass),so I decided to guinea pig them. I also added new wheels and kW coils will be installed come this Monday.

Thus far I'm ECSTATIC with the upgrade! I paired the downpipes with a Milltek resonated system. This marriage has produced the most harmonious orgasmic sound I've heard this far.

In terms of power it doesn't seem to do much down low but top end you can feel the added power very well. Dyno results proved to add 30 horsepower and 9 ft lbs of torque. The upgrade was worth the money and I'm glad I made the move.

The fitment was precise. I watched the install process and was very pleased with build quality and fitment being the first to have them installed. I can't get enough of the car, it just makes me want to drive it that much more lol.

I will upload a sound clip, which doesn't do it justice but will give some kind of clue the pure sex this car oozes. If you want to see pictures of the pipes check them out on Euroteks website (etektuning.com)





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[drob23]

I'm confused, you mean catless testpipes that bolt to the exhaust manifold? E.g. the ones upstream from the downpipes shown below in the figure? I have JHM test pipes and the sound is pretty good with my neuspeed exhaust. But a little "tin" like. Interesting about your milltek setup Maybe I just have the wrong exhaust from downpipes back. Do you have a test pipe tune to remove CEL's?

Also, how was your install? I couldn't find anyone who would do it for a reasonable rate, so had the install done by someone who dropped the whole engine. Allowed me to easily swap motor mounts. Was overkill, but I trust the mechanic and would rather have it done correctly rather than cheaply.

[riseabv]

I'm confused, you mean catless testpipes that bolt to the exhaust manifold? E.g. the ones upstream from the downpipes shown below in the figure? I have JHM test pipes and the sound is pretty good with my neuspeed exhaust. But a little "tin" like. Interesting about your milltek setup Maybe I just have the wrong exhaust from downpipes back. Do you have a test pipe tune to remove CEL's?

Also, how was your install? I couldn't find anyone who would do it for a reasonable rate, so had the install done by someone who dropped the whole engine. Allowed me to easily swap motor mounts. Was overkill, but I trust the mechanic and would rather have it done correctly rather than cheaply.

Yes, they are the catless bypass pipes off the manifold. I am running apr's software and yes they have a test pipe tune so I have no CEL.

The install was very smooth. They dropped the engine a bit as well for a quick and easy install. I agree I wanted it done right but it depends on each mechanic and how much they charge per hour and then the "book" time.

I don't have a "tinny" sound at all. I would say if nothing else in person it has this deeper burble tone. It sounds amazing especially compared to the other exhausts I've heard in person.

Drob did you have your car dyno'd before and after? Are you feeling any power up top?


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[mehware]

How much for the pipe, would you get added sound and performance on stock exhaust?

[riseabv]

How much for the pipe, would you get added sound and performance on stock exhaust?

You would be bypassing all those cats so yes you would produce more power. If you pre-order the pipes they are only 800 vs the 900 price point they will be retail. They sound great but I'm not sure how it would sound on the stock exhaust but I would definitely change the tone.


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[mehware]

Jeez, 800 for castles down pipes. That's an expensive piece of metal. Thanks for the info.

[S4 00 2.7]

in for video.

[mr shickadance]

keep in mind these are $800 or $900 then on top of that factor in like a $500 to $800 for the install

[drob23]

Yes, they are the catless bypass pipes off the manifold. I am running apr's software and yes they have a test pipe tune so I have no CEL.

The install was very smooth. They dropped the engine a bit as well for a quick and easy install. I agree I wanted it done right but it depends on each mechanic and how much they charge per hour and then the "book" time.

I don't have a "tinny" sound at all. I would say if nothing else in person it has this deeper burble tone. It sounds amazing especially compared to the other exhausts I've heard in person.

Drob did you have your car dyno'd before and after? Are you feeling any power up top?


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Interesting, I'm guessing the tinny sound is more a function of my exhaust. It didn't sound this way with the Cats there. I have always loved the sound of the milltek, I just wanted something that I could easily install.

I did not have my car dyno'd before. you can read about the ordeal that lead to me going catless here http://tinyurl.com/omjynsc lol I will say that my car felt pretty damn quick last weekend out on track. I'll probably go benchmark it again at the 1/4 mile strip once the temps drop.

I'm starting to come around to the smell...which at first I thought would be annoying...but now it's not so bad. I just can't sit there and idle in my driveway for a long time.

[derek.kritz]

So we have all been anxiously waiting to upgrade these 3.0t platforms to extract power. Well my local boutique shop developed a set of catless downpipes(cat bypass),so I decided to guinea pig them. I also added new wheels and kW coils will be installed come this Monday.

Thus far I'm ECSTATIC with the upgrade! I paired the downpipes with a Milltek resonated system. This marriage has produced the most harmonious orgasmic sound I've heard this far.

In terms of power it doesn't seem to do much down low but top end you can feel the added power very well. Dyno results proved to add 30 horsepower and 9 ft lbs of torque. The upgrade was worth the money and I'm glad I made the move.

The fitment was precise. I watched the install process and was very pleased with build quality and fitment being the first to have them installed. I can't get enough of the car, it just makes me want to drive it that much more lol.

I will upload a sound clip, which doesn't do it justice but will give some kind of clue the pure sex this car oozes. If you want to see pictures of the pipes check them out on Euroteks website (etektuning.com)





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How much did Leo charge u to install them. And, how are you gonna pass smog with them now?


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[BennyonB8gs]

In for sound clips.

[riseabv]

How much did Leo charge u to install them. And, how are you gonna pass smog with them now?


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Install was 800 from start to finish. The remedy for smog was to utilize a set of catted spacers ;)


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[riseabv]

Interesting, I'm guessing the tinny sound is more a function of my exhaust. It didn't sound this way with the Cats there. I have always loved the sound of the milltek, I just wanted something that I could easily install.

I did not have my car dyno'd before. you can read about the ordeal that lead to me going catless here http://tinyurl.com/omjynsc lol I will say that my car felt pretty damn quick last weekend out on track. I'll probably go benchmark it again at the 1/4 mile strip once the temps drop.

I'm starting to come around to the smell...which at first I thought would be annoying...but now it's not so bad. I just can't sit there and idle in my driveway for a long time.

I'd love to see the 1/4 mile results bro. Post them up when you get a chance to re-test. I raced a sepang s4 I believe was running stg2+ giac and started to slow pull on him going through the top end of second. Take into account I'm running a set of 20x10 cast wheels so that makes a pretty bold statement. Im going to try and hunt this guy down to get the exact info on his car as Vegas doesn't have a large s4 audience.


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[derek.kritz]

Install was 800 from start to finish. The remedy for smog was to utilize a set of catted spacers ;)


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🏼🏼


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[Bikel]

curious... what size tires you run'n on the 9.5 rims? cant really tell, but looks good without too much stretch here...

[riseabv]

These are 20x10 and I'm running some big cajones tires. I decided to run a 275/30, why, because I don't f around lol.


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[Bikel]

OK. fooled me as your sig says 19x9.5 Stance SC6? So any rubbing with these badboys?

[PCHS4]

For a little more money a used set of EC headers is another option.

[riseabv]

OK. fooled me as your sig says 19x9.5 Stance SC6? So any rubbing with these badboys?

No rubbing at all. I just had the new wheels installed that's why I haven't update the info in my sig. Love the setup and the ride, being so wide and meaty it's much more plush and at the same time grips pavement very well.


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[riseabv]

For a little more money a used set of EC headers is another option.

Bro are you nuts? Install alone is 2k for the EC headers, at least from the last post I saw in install. Plus the headers are still going to cost quite a bit more.




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[PCHS4]

Bro are you nuts? Install alone is 2k for the EC headers, at least from the last post I saw in install. Plus the headers are still going to cost quite a bit more.




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Might be nuts, but that is not relevant to this discussion. Install is $1K, least that is what I paid. Used set $1200, so we are talking $2200 vs. what $1800 for the downpipe deal. Still not sure how that works because the cats are attached to the OEM manifold.

[riseabv]

Might be nuts, but that is not relevant to this discussion. Install is $1K, least that is what I paid. Used set $1200, so we are talking $2200 vs. what $1800 for the downpipe deal. Still not sure how that works because the cats are attached to the OEM manifold.

The OE cats are bolted to the stock manifolds. Eurotek's bypass pipes bolt to the manifolds the same way and gain 28hp. That's a 2hp difference compared to EC's headers. It sounds like you got a bargain. But most shops are going to charge far more than $1k for install and not to mention how many used pipes are currently available. And if there are a lot of them, why? What are people not sharing about them? Either way both of these products are great. But I'm sure EC isn't going to warranty your used set of headers if they were to fail. So to save a bunch of money in exchange for 2hp and have a new product with a lifetime warranty, I'll stick with the Eurotek Cat bypass pipes.


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[PCHS4]

The OE cats are bolted to the stock manifolds. Eurotek's bypass pipes bolt to the manifolds the same way and gain 28hp. That's a 2hp difference compared to EC's headers. It sounds like you got a bargain. But most shops are going to charge far more than $1k for install and not to mention how many used pipes are currently available. And if there are a lot of them, why? What are people not sharing about them? Either way both of these products are great. But I'm sure EC isn't going to warranty your used set of headers if they were to fail. So to save a bunch of money in exchange for 2hp and have a new product with a lifetime warranty, I'll stick with the Eurotek Cat bypass pipes.


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Thanks for the explanation: that makes a lot of sense. I am trying to figure out what to do about my EC header situation. The headers are great and I have never had any issues. But, my car is going be coming up on 5 years old and will need cats for emissions. Right now I don't know of any cat downpipes that I can buy. So I was thinking of going back to OEM and in that case I would sell the headers. I think this is a common reason for seeing used ones for sale. I have not heard of a case of the EC headers failing and folks race the sh*t out of them. My apologies if I am out of context on this thread. I was just thinking $1800 for a set of installed downpipes was pretty spendy. How do they sound compared to the headers?

[PCHS4]

Install was 800 from start to finish. The remedy for smog was to utilize a set of catted spacers ;)


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Can you say more about these catted spacers? Do they go in place of the regular downpipes, between the test pipe and the exhaust?

[riseabv]

Can you say more about these catted spacers? Do they go in place of the regular downpipes, between the test pipe and the exhaust?

http://www.etektuning.com/griffin-mo...sensor-spacer/


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[PCHS4]

http://www.etektuning.com/griffin-mo...sensor-spacer/


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I see those are the spacers for the O2 bung. But, I don't see how that is a remedy for smog, I though all they do is clear the CEL? Still won't pass smog test.

[drob23]

You could weld some HFC's into the downpipes. That should in theory pass the sniffer. Question is what the inspection consists of, whether it be visual, obd etc.

[PCHS4]

You could weld some HFC's into the downpipes. That should in theory pass the sniffer. Question is what the inspection consists of, whether it be visual, obd etc.

I would love to do that, just can't find anymore that really wants to do it. EuroCode is skeptical about the HFCs that are currently available. I was hoping someone had been down this road before and had a ready made solution.

[derek.kritz]

I see those are the spacers for the O2 bung. But, I don't see how that is a remedy for smog, I though all they do is clear the CEL? Still won't pass smog test.

They probably won't. Right now he is running the test pipe file. Which shuts off the post cat O2 sensors. And the cel. To pass smog he is gonna need to flash it to stock, then wait for readiness of the O2 sensor and pray that the spacers are reading the correct balance of gasses that simulate the catalytic converters being there. Too much gas, cel. Not enough fumes, cel. There is a happy medium to get her just right. Good luck!!!


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[riseabv]

I see those are the spacers for the O2 bung. But, I don't see how that is a remedy for smog, I though all they do is clear the CEL? Still won't pass smog test.

How will I not pass smog? Most states no longer run a "sniffer" test and provide an obd bung while they run the car looking for CEL's and abnormalities. Maybe I'm missing something..


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[riseabv]

They probably won't. Right now he is running the test pipe file. Which shuts off the post cat O2 sensors. And the cel. To pass smog he is gonna need to flash it to stock, then wait for readiness of the O2 sensor and pray that the spacers are reading the correct balance of gasses that simulate the catalytic converters being there. Too much gas, cel. Not enough fumes, cel. There is a happy medium to get her just right. Good luck!!!


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I'll send you my smog results when I pass ;)

I should have no issues in Nevada passing smog as it's obd tested.


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[PCHS4]

I'll send you my smog results when I pass ;)

I should have no issues in Nevada passing smog as it's obd tested.


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It seems to differ from state-to-state. In Arizona I believe they do a visual inspection for the cats. In the city of LA there is a more extensive tailpipe test, at least there was, maybe it has changed.

[derek.kritz]

I'll send you my smog results when I pass ;)

I should have no issues in Nevada passing smog as it's obd tested.


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For sure! They don't check visually in Nevada so you will be good there. In Nevada, it used to be that post cat O2 sensors could be read as "not ready" and you could still get smogged. As of 2 years ago, the rear cats must be on and ready to get smogged. Then of course, they must be reading the correct amount of exhaust gas to pass the test. Removing the cats will make you throw a rich code and fail emissions. That is where the spacers come in. You are "fooling" the O2 sensors into reading the correct reading as you would if having cats. This is where the problem lies. What is the correct position and angle of the spacers? To much exhaust gas, fail test with rich code. To little gas hitting the sensor, lean and fail. Trial and error must be preformed to reach that "sweet spot". Unless you are extremely lucky and get it right the first time. Which you may. Keep us updated when you get smogged to see the proper angle the spacers were set at to pass.


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[joewhy2k]

Why have I never seen you around town? Looks like you were on base in one of those pics!

[derek.kritz]

Why have I never seen you around town? Looks like you were on base in one of those pics!

Hahaha. Don't make it to many meets with my schedule. . That and family job, ect. I live in spring valley. Kinda stay around there.


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[joewhy2k]

Hahaha. Don't make it to many meets with my schedule. . That and family job, ect. I live in spring valley. Kinda stay around there.


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Not you lol I'm talking about riseabv. I've seen your car around before derek.kritz. You have white lettering on your tires right?

[derek.kritz]

Not you lol I'm talking about riseabv. I've seen your car around before derek.kritz. You have white lettering on your tires right?

Hahaha. Yeah sure do!!


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[joewhy2k]

Hahaha. Yeah sure do!!


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Yeah after seeing your car I was really considering doing it to mine also lol looks good on yours.

[derek.kritz]

Yeah after seeing your car I was really considering doing it to mine also lol looks good on yours.

Thanks. Yeah, I have a set of 20's as well with some stretched tires. Figured I'd mix up the 19's with some fat rubber and racer boy look. Pretty happy with it. I'll tell ya, I get more looks than one could imagine. Lot of people trying to race me too...


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[drob23]

For sure! They don't check visually in Nevada so you will be good there. In Nevada, it used to be that post cat O2 sensors could be read as "not ready" and you could still get smogged. As of 2 years ago, the rear cats must be on and ready to get smogged. Then of course, they must be reading the correct amount of exhaust gas to pass the test. Removing the cats will make you throw a rich code and fail emissions. That is where the spacers come in. You are "fooling" the O2 sensors into reading the correct reading as you would if having cats. This is where the problem lies. What is the correct position and angle of the spacers? To much exhaust gas, fail test with rich code. To little gas hitting the sensor, lean and fail. Trial and error must be preformed to reach that "sweet spot". Unless you are extremely lucky and get it right the first time. Which you may. Keep us updated when you get smogged to see the proper angle the spacers were set at to pass.


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Great post! Yea, I'm not sure the apr test pipe file will show readiness. I called apr and I *thought* that is what they said, but maybe I interpreted something wrong. Wonder if it's the same with giac and revo. I live in Michigan, so none of this is really a concern haha

My assumption was also that if you drove up catless they would immediately fail you, because the smell is pretty obvious. If a shop does smog testing, they probably know what catless smell like lol

So my comment about welding in some quality hfc was more to address the smell I guess.

Edit - I don't think the test pipe file disables the secondary o2. Secondary o2 sensors are usually narrowband hego sensors that read something like -1,0,1 based on where you are relative to stoic. They are apparently quite accurate. In other applications, the secondary o2 helps estimate an offset error for the primary o2.

I also believe the simos ecu additionally throws a dtc calculated on the delay between exhaust fumes going from the primary and secondary sensors. The sensitivity of this calculation is very high, which I believe is the reason no company's sell hfc's for this platform...none of them pass readiness. You can read about this in the old 034 hfc threads.