Blew my cats, what should I run? magnaflow?

[blk18tq]

Gotta pay to play! lol!
Been stage 2 for 2 yrs on e85 mix with 91, it was bound to happen. has anyone used these magnaflow cats? could you give me a review of them or any other options out there.

https://www.ecstuning.com/b-magnaflo...eft/49135~mag/

thanks in advance :)

[speedy0339]

Just curious, does giac have a mix tune, or were you using a 100 map with your blend?

[blk18tq]

Just curious, does giac have a mix tune, or were you using a 100 map with your blend?

no mix tune, I would use "Race" mode which is for 100 octane or E85 mix

[infinkc]

if you blew your cats, just run them gutted.

[blk18tq]

if you blew your cats, just run them gutted.

but then i wouldn't be able to pass a smog check when needed.

[derek.kritz]

but then i wouldn't be able to pass a smog check when needed.

Has anyone tried running some long spacers and/or spark plug extensions to get to get the o2 sensors far enough away to go catless??


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[bhvrdr]

I'd gut your OEM ones and then run the magna flows underneath your car. This way if you blow a few more times it's really no big deal to replace

[blk18tq]

I'd gut your OEM ones and then run the magna flows underneath your car. This way if you blow a few more times it's really no big deal to replace

that is a good idea i might have to consider :)

[sonic32]

If you literally blew them out and the car is still driving good with no problems save yourself the labor money. They're labor intensive to take out. And if they do smelling tests in your state do what people suggested, cut out resonators from downpipes and run cats there. That's what I was gonna do. I was gonna go high flow cats or test pipes when I blew the flange off the passenger side cat but I didn't find any good reviews whatsoever and people made less power cat less


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[blk18tq]

If you literally blew them out and the car is still driving good with no problems save yourself the labor money. They're labor intensive to take out. And if they do smelling tests in your state do what people suggested, cut out resonators from downpipes and run cats there. That's what I was gonna do. I was gonna go high flow cats or test pipes when I blew the flange off the passenger side cat but I didn't find any good reviews whatsoever and people made less power cat less


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my car started with the note of the exhaust changing then white color on the inside of left (driver side) muffler tips, and now check light with misfires on cylinders 4-5-6-, coil packs and spark plugs fine, cats are clogged or damaged. now when I try to give it to much throttle it will go into a limp mode.

[schirm]

my car started with the note of the exhaust changing then white color on the inside of left (driver side) muffler tips, and now check light with misfires on cylinders 4-5-6-, coil packs and spark plugs fine, cats are clogged or damaged. now when I try to give it to much throttle it will go into a limp mode.

MY exact symptoms luckily Audi dealership replaced them for free while stage 2 and over the 80,000 mile warranty.

[blk18tq]

MY exact symptoms luckily Audi dealership replaced them for free while stage 2 and over the 80,000 mile warranty.

Lucky!! must have a good connect at that dealer :)

[blk18tq]

will I need do anything to my software if i gut the cats?

[schirm]

will I need do anything to my software if i gut the cats?

Just the update that eliminates the 02 sensor.

[blk18tq]

Just the update that eliminates the 02 sensor.

can i do that with GIAC? my tuner in town I'm sure can find out how, just wasn't sure if it could be done with GIAC.

[Hofahome]

I would like to know if specific tunes (ie. Giac vs apr vs revo vs epl) wear out cats more quickly. I have seen several cat failures on guys running giac and wonder if it is due to the tune running richer than others. And yes I know some stock s4's destroy cats.

[B18b1ex]

my car started with the note of the exhaust changing then white color on the inside of left (driver side) muffler tips, and now check light with misfires on cylinders 4-5-6-, coil packs and spark plugs fine, cats are clogged or damaged. now when I try to give it to much throttle it will go into a limp mode.

Mine has been at the dealer for more than a week waiting for Cats from Germany, under warranty, if you are under 8/80,000 it should be covered I think.


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[schirm]

I would like to know if specific tunes (ie. Giac vs apr vs revo vs epl) wear out cats more quickly. I have seen several cat failures on guys running giac and wonder if it is due to the tune running richer than others. And yes I know some stock s4's destroy cats.

My car went at 105,000 miles APR tuned for 55k

[sigaddict]

I would like to know if specific tunes (ie. Giac vs apr vs revo vs epl) wear out cats more quickly. I have seen several cat failures on guys running giac and wonder if it is due to the tune running richer than others. And yes I know some stock s4's destroy cats.

Seems like giac is the biggest cat destroyer so far

[blk18tq]

Mine has been at the dealer for more than a week waiting for Cats from Germany, under warranty, if you are under 8/80,000 it should be covered I think.


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dealer won't cover if car is modded.

[schirm]

dealer won't cover if car is modded.

They covered mine at 105,000 miles and stage 2.

[mrb5_supra_wrx]

screw test pipes just do this: http://www.audizine.com/forum/showth...ew-S4-S5-A6-A7 this guy is trying to hike the prices up to $950 but i think a couple of us are gona go in on a group buy. there only $235 for longtube headers and their legit s4matty approved he's running them and says their legit

[derek.kritz]

Son of a Bioch!!! What a deal. If there was a legit way to not throw a cel and for me to pass emmision, I'd rock them for sure.


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[sonic32]

Son of a Bioch!!! What a deal. If there was a legit way to not throw a cel and for me to pass emmision, I'd rock them for sure.


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There is. They can tune it out


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[derek.kritz]

There is. They can tune it out


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Right, but in Nevada, the post cat o2 sensor has to be on and ready to pass. They started this bs in 2010.


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[onlyaudis]

There is. They can tune it out


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smart emissions testers are not fooled anymore by "tuned out" emissions tests. Not after the big VW scandal. In California, all emissions components in the ECU must show readiness. any inconclusive readings will fail you (Revo used to do this with the Cats) . also, I heard if they suspect your software is messing with this, they may reset the emissions readiness, and if the Cat or O2 shows readiness right away, they know you have software interfering with the process, as it should take a little while for the readiness settings to relearn.

I found out Mercedes is now offering relatively inexpensive factory rebuilds on their cats with full warranty. wonder if Audi will follow this.

[Thurston]

screw test pipes just do this: http://www.audizine.com/forum/showth...ew-S4-S5-A6-A7 this guy is trying to hike the prices up to $950 but i think a couple of us are gona go in on a group buy. there only $235 for longtube headers and their legit s4matty approved he's running them and says their legit

I was messaging back and forth with someone from mertop earlier today . . . i bet if u said i'll give you $300 they'd be all in. hell, i bet they'll manufacture and sale em for the $235 individually w/o a group buy but regardless i'd be mildly interested in any group buy deal you all strike.

[mrb5_supra_wrx]

I was messaging back and forth with someone from mertop earlier today . . . i bet if u said i'll give you $300 they'd be all in. hell, i bet they'll manufacture and sale em for the $235 individually w/o a group buy but regardless i'd be mildly interested in any group buy deal you all strike.

Did you message them thru Alibaba or directly thru their email, etc.? I messaged them thru Alibaba and haven't got a response yet

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[mrb5_supra_wrx]

Well nvm just found a link for single purchase https://m.aliexpress.com/s/item/3274...il2msiteDetail

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[derek.kritz]

I just wish there was a more affordable replacement than the OEM cats. Back to the topic, I don't see how the Magnaflow ones will be any worse. I mean, so many of the OEM ones are only lasting 40-60k miles. There are the JHM ones also that are HFC. And I think they took care of the O2 sensor placement that has been an issue on them.


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[HeymyAudi]

What were the signs that your cat was blown??

[B18b1ex]

What were the signs that your cat was blown??

There was a change in exhaust note, and an odor. Oh and these indicators.




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[blk18tq]

http://www.magnaflow.com/products?partnumber=49135

guess i'll be the first one to test these magnaflow cats @ $438 each and report back :)

[miztahsparklez]

http://www.magnaflow.com/products?partnumber=49135

guess i'll be the first one to test these magnaflow cats @ $438 each and report back :)

Interesting.


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[Loe]

Has anyone tried running some long spacers and/or spark plug extensions to get to get the o2 sensors far enough away to go catless??


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You will end up getting a sensor "2" rich/lean response too slow CEL.

I'm currently testing Area74 simulators on my JHM HFC set-up. It's an active simulator that takes the signal from the O2 sensor and sends a corrected signal to the ECU; essentially when a signal too rich is being sent to the Area74 simulator (higher mV), it sends a lower voltage to the ECU side. So far I've been able to pass all OBD-II readiness (but I can guarantee that I will fail an actual sniffer, thankfully no emissions in FL), I'm just waiting to see if a CEL creeps up for cat inefficiency (P0420/P0430); it corrects the rich signal (the ECU seems no higher than .83x mV), however it doesn't correct a lean signal (too much oxygen, or a lower mV reading), which will happen from time to time even with the stock cats such as when you are sitting at a stop-light or stationary. My understanding is that the ECU will only trigger a cat inefficiency if the voltage sharply spikes too fast from rich to lean, but not normal to lean, but time will tell.

With that being said, it you want to give it a shot with the Area74 simulators, the wiring harness on our O2 sensors are as follows:

Pin 4 - (black) signal wire
Pin 3 - (gray) signal ground
Pin 2 - (white) O2 heater power
Pin 1 - (white) O2 heater ground

I'll make a proper post about it with pictures of how to hook it up as soon as I can confirm that it will not trigger a CEL, I'm only 150miles into testing, but so far so good without triggering a CEL and 100% passed readiness with the HFC. It will be a nice option for those who only have OBD-II testing for "readiness" as you may not pass it with a software delete.

[chevelle71]

I blew my cats. Waiting on apr to send an updates file to tune it out. Check engine keeps coming back on.

[bokiboki]

They covered mine at 105,000 miles and stage 2.

^Hey Schrim, would you please PM me the name of the dealership that you used for this and any other specifics? Thanks.

[schirm]

^Hey Schrim, would you please PM me the name of the dealership that you used for this and any other specifics? Thanks.

Done

[derek.kritz]

Thanks Leo, you're the man...are you liking the JHM HFC's?? Do you have the updated version where the o2 bung is in the correct position? My buddy has them and is throwing a the P0430 with them. He was thinking the Cat was no good on that side...u think that is normal for the HFC to throw that? And if I was reading your post correctly, there isn't a way to get rid of that code...


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[Loe]

Thanks Leo, you're the man...are you liking the JHM HFC's?? Do you have the updated version where the o2 bung is in the correct position? My buddy has them and is throwing a the P0430 with them. He was thinking the Cat was no good on that side...u think that is normal for the HFC to throw that? And if I was reading your post correctly, there isn't a way to get rid of that code...


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He could try a very very shallow spacer to get rid of that code (may or may not work, but they are cheap on amazon), but yeah you run the risk of the P0430/P0420 code with the HFC, or a CEL for a "response too slow rich/lean" when using a spacer. The cat isn't bad, its the nature of going from an almost 1,000 cell cat to a 200-300 cell cat. I get (or at least had) those codes too, but the Area74 sims so far has cured the code. If he plans on using a spacer, make sure its not an "isolated" spacer as it will amplify the response too slow rich/lean condition to trigger a CEL.

I purchased my JHM cats knowing they bung locations were not correct (they made the O2 sensor face upwards, which would hit the body of the car). I had my exhaust/tuning shop relocate the bungs to have the sensor pointing inwards towards the transmission with allows perfect clearance without the need for spacers.