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09-28-2019, 10:45 PM | #1 |
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Exhaust recommendations
I've been searching and reading through exhaust threads and articles online covering exhaust mods for e92 M3s for the last couple of weeks. I'm feeling a bit stumped and hoping I can get some situation-specific input.
I've got a 2012 e92 M3 that I'm looking to change the exhaust on. I'd like the most power benefit I can get without getting any exhaust smell in the car. When I purchased it, the car had an IPE valvetronic exhaust with no cats and the smell was nasty (plus, I have to pass emissions). So, what's the path here? Do I just need to get an x pipe with high-flow cats? From what I've read it's the first set of cats that create the most restriction--are there high-flow versions of those that I can purchase? Should I change all 4 to HF? Appreciate the help! |
09-29-2019, 07:55 AM | #2 |
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You have options but sounds limited. I don't know if 4 HFCs will get rid of the smell that some have. I'm running a full Akra setup and there is little bit of a smell until the cats warm up; however, I don't have to deal with emissions down here. You may want to look at the challenges line up of new x-pipes. They have one that deletes the secondary cats and retains the primaries. Smell is not an issue and it would allow you to pass emissions I do believe.
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09-29-2019, 09:45 AM | #3 |
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Thanks for the reply. Couple of questions:
Does the full akra setup maintain all the cats? If I used Macht Scnell test pipes, would those stink and could I simply reattach the primary cats when needed for emissions? I don’t have a problem with a little smell on warm-up. I just don’t want to be stopped at a light and have it building up in the car or smell it while I’m driving. |
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09-29-2019, 03:20 PM | #4 | |
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09-29-2019, 03:26 PM | #5 | |
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09-29-2019, 10:29 PM | #6 | |
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09-29-2019, 11:27 PM | #7 | |
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09-30-2019, 05:10 AM | #8 | ||
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09-30-2019, 11:12 AM | #9 | |
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I'm actually debating at this point about just saving the money and doing an SC. Part of me really doesn't want to do FI on such a great N/A engine, but.... |
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09-30-2019, 11:17 AM | #10 | ||
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10-03-2019, 10:10 PM | #12 | ||
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10-03-2019, 10:51 PM | #14 | |
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What kind of car do you have op, what's the color?
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10-04-2019, 11:49 AM | #16 |
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The Evolve HFC X-Pipe has 200 cell cats, I'd probably go for that. You can also buy new challenge pipes from IND as they brought them back. There are loads of other options for HFC, Gintani, ESS etc.
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10-04-2019, 01:12 PM | #17 |
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Evolve stuff is made by supersprint and is really nice stuff.. I'm selling a supersprint system but it's catless.. I'd part with the muffler only though if your interested. Pm me
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10-04-2019, 03:03 PM | #19 |
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If OR smog is anything like CA smog tests most of the mentioned setup will not work unless you have a tune. This is because most sport x-pipe put the cats in where the secondary cats usually go. Leaving the primary o2 sensor locations getting catless readings. A Tune will turn off the catless monitor and the secondary o2 sensor which leaves 1 or 2 monitors not ready. OR might allow for 1 monitor not to be ready but if both cat and secondary o2 are not ready you might have issues.
The RKP street x-pipe will work since it uses the primary cats and deletes the monitored secondary cat. Ess used to make a high flow x-pipe with the cats in the primary location but doesnt anymore. AFE is the only one I know that makes a high flow catted x-pipe with the cats in the correct location.
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10-04-2019, 03:43 PM | #20 |
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Got it. I planned to swap back to stock for the emissions test. It's only every 2 years and I am going to get it done here in the next few weeks.
What I'm really running into is that I don't want something that smells. I'm unfortunately fairly sensitive to that. That being said, when I bought the car, it had a catless IPE system on it. It wasn't pleasant but I could def. drive it--unlike the old STI that I put a catless downpipe on....Blech. I switched to a high-flow cat pipe though and had no issues. So, the real question here is that I don't know if removing some of the cats and switching to HFCs will cause a smell that bugs me. I have found 0 cost-effective solutions so far where all cats are switched to HF. That leaves me thinking the best option might be to get a used pipe with high-flow secondaries and see how the smell is for me. I do stop-n-go driving and don't want to smell it in the car when I have the windows down in traffic. |
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10-04-2019, 03:54 PM | #21 | |
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