Milltek downpipe with cat. (photos)

[silvino]

I took a few pics before the install started this morning. Thanks to Paul @ Supreme Power for helping me pick this up.

https://photos.app.goo.gl/iXe52uFK8I6vDU8F2

In a rush to take the photos, I realize that I forgot a nice view of the cat "honeycomb" to see the 200 cell density.

[sciblades]

How much?

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[silvino]

PM me for pricing.

Btw, I wasn't overly impressed with the welds but I can't say there's an outright defect with anything. I'm a little biased though because I had a lot of custom work done in the past by a super skilled welder.

[OE2]

are you putting this on with a tune or without? I hope without so we know if it will throw a code or not.

[chris3g]

the cat is after the o2 sensors, it's going to throw a code in the same way full catless would.

mine looks exactly the same, the welds are definitely not aesthetically pleasing.

[silvino]

I will have it on without tune for a few days because my Custom Code flasher arrives later this week (I hope!).

The car will absolutely throw a code and is a big reason why I posted the pictures since I lacked this detailed info. The 2nd O2's bung is not very far after the first one. As far as that second sensor is concerned, it's like it has a straight pipe on because the cat is way down the line. The only purpose this cat servers is cleaning the air going out of the tailpipe and won't stop any codes.

[comingabriel]

Sorry, but that is hideous.... My baby deserves better, even if I have to make it.

[seanix9]

Sorry, but that is hideous.... My baby deserves better, even if I have to make it.

Lol... It does look like a backyard job.

Are there other options out there that offer a catted DP?





Current: 2018 RS3 Sedan
Past: 2016 RS3 SB

[speeddemon69]

OMG just opened the pictures and zoomed in and was in disbelief that it bears the milltek branding. Looks horrible.


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[saxon]

I've yet to see a milltek downpipe that didn't look like a garage mig job.

[S3DUDE]

I am so glad that someone said before me, it literally took the weight off my shoulders but in my humble opinion the downpipes looks terrible. The first elbow from the turbo looks terrible. I know that you are in Cali and you have to have a cat but have you consider the one from IROZ and had a shop install a cat?

I don't want to rain on your parade but like other have said it looks terrible. If I were a MILTEK vendor I personally would look the other way and wouldn't carry it.

[silvino]

As ugly as it seems, I doubt performance will be affected by it's ugliness. I also don't really have much of an option as far as returning it.

Modifying the IROZ to have a cat isn't as simple as it seems due to fitment/spacing issues. The best answer would be full custom with some possible trial and error in the design.

Enjoy making decisions off of my experience :).

Btw, the car sounds better than the IROZ DP videos I've seen although not as loud. I'll get vids up once I have a decent AV setup to do so.

[silvino]

No check engine light after a bit of driving. I'm guessing it's just a matter of time though.

[Optimus812]

Cool, I've been looking for a high flow cat DP. Not in love with the funky looking mig welds, but if it works this might be an option.

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[Veneeringman]

Have any of you chaps that have fitted the DP to the facelift RS3 noticed an increase in the start up rattle/ticking noise ?

Several UK owners are reporting ticking noise under acceleration too........

[comingabriel]

Lol... It does look like a backyard job.

Are there other options out there that offer a catted DP?

AWE is to release exhaust options by the end of this month or June.

[seanix9]

Have any of you chaps that have fitted the DP to the facelift RS3 noticed an increase in the start up rattle/ticking noise ?

Several UK owners are reporting ticking noise under acceleration too........

Yes mate.

Feedback from Aussie owners is that there is increased rattle.
Basically the rattle is amplified after DP install. I would think it's worse on the decat DP as opposed to catted.



Current: 2018 RS3 Sedan
Past: 2016 RS3 SB

[WAF]

As ugly as it seems, I doubt performance will be affected by it's ugliness. I also don't really have much of an option as far as returning it.

Modifying the IROZ to have a cat isn't as simple as it seems due to fitment/spacing issues. The best answer would be full custom with some possible trial and error in the design.

Enjoy making decisions off of my experience :).

Btw, the car sounds better than the IROZ DP videos I've seen although not as loud. I'll get vids up once I have a decent AV setup to do so.

Silvino any chance you sent a few pics of the welds etc to Milltek and see if its an off make or are they all the same?

[silvino]

Good idea. I'll do that and report back if I hear anything. I'm sure they care more about function than beauty but at some point sketchy welds could lead to leaks or failures. I expected more for sure.

Silvino any chance you sent a few pics of the welds etc to Milltek and see if its an off make or are they all the same?

[Hugonzalez01]

PM me for pricing.

Btw, I wasn't overly impressed with the welds but I can't say there's an outright defect with anything. I'm a little biased though because I had a lot of custom work done in the past by a super skilled welder.

Agree with observation and definitely no issue present if it sounds good, performs like intended and doesn’t leak... your fine.. who cares if u have few Friday afternoon welds on the one u got.!


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[silvino]

A small update on the sound of the setup.

I'm getting a "ticking" sound that's like an exhaust leak but after much inspection, we've chalked it up to being exhaust gas pulses that are more audible with the removal of the stock cat. You can only hear it faintly at low speed, load and rpm. Otherwise you don't notice it.

The great news is that I don't get any of the ugly overly raspy or "tinny" sound that you prominently hear in the various videos of IROZ DP setups. I'm guessing this has to do with the combo of potentially thicker wallet piping and/or the existence of a cat in the system. Either way, a plus in my book. (edit: I acknowledge the IROZ setup is still a better power option.)

I'm still planning out the AV gear and may start with an older but solid Panasonic camcorder. If I test it and the sound quality is decent, I'll post a prelim clip until I order the Gopro w/ external mic.

[KKOG]

For many reasons I like the OEM mig welded look of it.
As a contrast to all TIG welded China crap out there.

[15DGR V6]

Anyone try the CTS Turbo DP? It'd be nice to see a dual high flow cat option for the secondary pipes along with O2 sensor bungs after the cats and O2 extension cables.

http://www.ctsturbo.com/cart/product...pe-5021-0.html

[silvino]

Cats are more effective the closer they are to the exhaust source like the back of the turbo so it might not clean as much being so far away. Mix lower cell density sport cats along with the longer distance and it may not clean well enough to smog. You'd also need a special cable to extend the O2 sensor even if you tried.

If you don't care about smog and only the smell, I guess it might clean enough for that reason.

In general you have to worry about fitment issues everywhere to keep a cat that's not in the stock location. It's pretty tight down there.

Anyone try the CTS Turbo DP? It'd be nice to see a dual high flow cat option for the secondary pipes along with O2 sensor bungs after the cats and O2 extension cables.

http://www.ctsturbo.com/cart/product...pe-5021-0.html

[15DGR V6]

Cats are more effective the closer they are to the exhaust source like the back of the turbo so it might not clean as much being so far away. Mix lower cell density sport cats along with the longer distance and it may not clean well enough to smog. You'd also need a special cable to extend the O2 sensor even if you tried.

If you don't care about smog and only the smell, I guess it might clean enough for that reason.

In general you have to worry about fitment issues everywhere to keep a cat that's not in the stock location. It's pretty tight down there.

That is the stock location for the secondary catalytic converters.

I don’t know that location from the engine makes them any less effective, but it does take them longer to get to operating temperature during a cold start, thus causing higher emissions during cold start.

Audi only moved the cats closer to the engine about 10 years ago with the introduction of the B8 platform (4 cylinders may’ve been sooner).

[silvino]

I thought you implied having no primary and just relying on a set of secondary cats which won't be enough.

The location that far away will not reach the same temp meaning it likely will see a drop in working efficiency and it only takes a 5-10% drop for you to start failing. 10+ years ago when they did things differently it may have been ok to meet older standards.

That is the stock location for the secondary catalytic converters.

I don’t know that location from the engine makes them any less effective, but it does take them longer to get to operating temperature during a cold start, thus causing higher emissions during cold start.

Audi only moved the cats closer to the engine about 10 years ago with the introduction of the B8 platform (4 cylinders may’ve been sooner).

[silvino]

Btw the idea should be fine if the only goal is to clean it up enough for a more pleasant driving experience :).

[chris3g]

A small update on the sound of the setup.

I'm getting a "ticking" sound that's like an exhaust leak but after much inspection, we've chalked it up to being exhaust gas pulses that are more audible with the removal of the stock cat. You can only hear it faintly at low speed, load and rpm. Otherwise you don't notice it.

The great news is that I don't get any of the ugly overly raspy or "tinny" sound that you prominently hear in the various videos of IROZ DP setups. I'm guessing this has to do with the combo of potentially thicker wallet piping and/or the existence of a cat in the system. Either way, a plus in my book. (edit: I acknowledge the IROZ setup is still a better power option.)

I'm still planning out the AV gear and may start with an older but solid Panasonic camcorder. If I test it and the sound quality is decent, I'll post a prelim clip until I order the Gopro w/ external mic.

I just got mine installed and if I hadn’t read this first I would be sure I had an exhaust leak. The symptoms seem the same, noticeable at low load, speed and RPM (it also stops completely when off the throttle). Did you ever get any audio ?

[silvino]

No audio yet even though I was pondering doing it this weekend. I lacked a copilot or mount to record it. I'll ping a friend to borrow one or to have them hold it while I do a pull. It'll be tough to catch the "ticking" sound without a great mic and mic setup.

Also, I did notice what looks like a tiny hole at one of the weld spots in my pictures at the flange but it just might look that way and not actually be a hole. It's an expected sound in all DPs even the non-cat versions from all the folks I've talked to. It's just described differently.

I just got mine installed and if I hadn’t read this first I would be sure I had an exhaust leak. The symptoms seem the same, noticeable at low load, speed and RPM (it also stops completely when off the throttle). Did you ever get any audio ?

[silvino]

Sent Custom Code logs with the map they suggested and hoping to get feedback soon. Maybe they'll make a new map for those of us with cats!

[Optimus812]

Sent Custom Code logs with the map they suggested and hoping to get feedback soon. Maybe they'll make a new map for those of us with cats!

That's great news, I'm going your route and just received my Milltek catted downpipe today. I also received the Fuel-It E85 sensor kit I need to install. Now just waiting to receive the CC software and IMS intercooler. I may have access to a dyno to do some comparison pulls or tuning if needed.

[nonm]

Any sound file for the catted dp? Did it get much louder? Does it drone? Fuel smell??

[chris3g]

Sent Custom Code logs with the map they suggested and hoping to get feedback soon. Maybe they'll make a new map for those of us with cats!

i've been logging mine for a while, im running the stg 2 93oct file with the catted downpipe and iroz intercooler. We found that everything looks pretty good except my car is pulling a bit more timing than would normally be expected, presumably this is due to a bit more restriction in the exhaust flow. I found that i needed to get a little more octane in the tank in order to run without any timing retardation. It would be interesting to see if your ignition logs show the same.

[silvino]

Life has gotten in the way so no videos but I have plans this weekend to use old school stuff like a camcorder and a copilot to capture it while I drive. :)

In sport it's definitely louder but with comfort on the stock exhaust system keeps things quiet. No drone and the only smell is at startup which even happened with the stock setup to some extent.

Any sound file for the catted dp? Did it get much louder? Does it drone? Fuel smell??

[silvino]

We can both post logs :).

I was seeing up to 12 degrees timing at higher rpm but really it's the combo of everything else too. You ran the more aggressive tune and I less if I'm not mistaken. They had me go with the map for DP (no cat) Stage 1+ (so for 93 octane, no FMIC). They felt that my FMIC gave me extra timing that I lacked to run only 91 octane.

I'll post my stuff later today.

i've been logging mine for a while, im running the stg 2 93oct file with the catted downpipe and iroz intercooler. We found that everything looks pretty good except my car is pulling a bit more timing than would normally be expected, presumably this is due to a bit more restriction in the exhaust flow. I found that i needed to get a little more octane in the tank in order to run without any timing retardation. It would be interesting to see if your ignition logs show the same.

[chris3g]

We can both post logs :).

I was seeing up to 12 degrees timing at higher rpm but really it's the combo of everything else too. You ran the more aggressive tune and I less if I'm not mistaken. They had me go with the map for DP (no cat) Stage 1+ (so for 93 octane, no FMIC). They felt that my FMIC gave me extra timing that I lacked to run only 91 octane.

I'll post my stuff later today.

here's my ignition with 93 octane and then again with some 100 octane mixed in, probably resulting in around 96 octane in the tank.

93

96


log on 93
https://datazap.me/u/chris3g/rs3-stg...6&zoom=141-182
log on 96
https://datazap.me/u/chris3g/timing-...zoom=3861-3902

the difference in actual performance was significant, i measured about 1 sec faster 100-200 (with draggy) without the pulled timing.

[Optimus812]

Chris3g, are you logging with VAG COM and exporting the data to CSV and importing to datazap? That's pretty cool.

[chris3g]

Chris3g, are you logging with VAG COM and exporting the data to CSV and importing to datazap? That's pretty cool.

Yes that’s exactly what I’m doing

[silvino]

I'll share my ignition, boost and fueling logs. Nifty site btw so I'm using it to share the info too :).

ignition link
boost link
fueling link

[chris3g]

I'll share my ignition, boost and fueling logs. Nifty site btw so I'm using it to share the info too :).

ignition link
boost link


fueling link

Your logs look nice and clean to me. But yes the map I’m running is definitely more aggressive, you’re at 9 degrees near redline in that log and I’m running 15 on the stg2 file.