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10-31-2019, 07:04 PM | #1 |
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More sound. Stay CA Smog Legal. HOW?
Hey guys.
Trying to get a little more of that V8 sound out of my e92 m3 but I'm in CA and really not interested in not staying Smog legal. I have a Dinan exhaust, and scanned the forums, but more require an X pipe that deletes resonator and or deletes cats.... Any ideas would be helpful! |
11-01-2019, 01:25 PM | #4 |
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Either get a muffler that'll muffle the sound less or take your car to an exhaust shop and have them cut out your secondary cats and resonators. You'll stay smog legal with a secondary cat delete.
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11-01-2019, 01:29 PM | #5 | |
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You will fail visual if they looked under your car. Best option, as someone already mentioned, is get a "race" exhaust or delete the resonators (Not cats). |
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11-01-2019, 01:54 PM | #6 | ||
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Jasonmag8.00 |
11-01-2019, 02:32 PM | #8 |
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Drives: 2011 E92 M3
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Buy a good X-Pipe of your choice.
Keep your old X-Pipe. Swap every time you have to do a SMOG. IT is not that hard to change the x-pipe from time to time. Or, as others have said, ditch the Dinan cans. I like them, but I am old and I like quieter systems.
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2011 E92 M3 - 6MT, ZCP, ZF LSD, ESS G1, Some other goodies... |
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11-03-2019, 06:58 PM | #9 | |
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2020 Ford Mustang GT 6MT PP1 444rwhp
(Sold)2013 M3 Coupe-MR/BLK ZCP, 2011 M3 Coupe-MR/Blk 2007 Porsche 997C2S Speed Yellow/Blk sport seats 2004 BMW M3 Imola/Blk |
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11-04-2019, 04:03 PM | #10 |
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I'm in the OC. so relatively close. What if I removed the secondary cats, kept resonators and but left dinan mufflers as is?? Similar?
Also I would assume removing secondary cats would negatively affect smog test no? |
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11-04-2019, 04:07 PM | #11 |
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This.
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11-05-2019, 01:59 PM | #12 |
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Really appreciate the feedback folks!
unfortunately the back and forth changing of x pipe isn't really worth it for me. (just too much hassle) I'm hearing 3 options. 1. Race Muffler- suggestions? 2. Secondary Cat Delete 3. Resonator delete. Which one will give the most OEM+ feel without being obnoxiously loud? (OEM+ loud to me means something like what the current oem muscle cars put out in terms of decibels) What are the key trade offs between option 2 and 3? (Secondary cat vs resonator?) |
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11-05-2019, 02:09 PM | #13 | |
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11-07-2019, 06:55 PM | #16 |
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I had a Race exhaust, sounded great but DRONED like crazy right around 2,000 RPM, which is where the DCT tries to keep your revs on the freeway, or any speed really.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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01-04-2020, 01:33 AM | #18 |
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Removing resonators: raspier, drone, a little louder. No effect on power or smell. As the name implies, they just effect sound waves and deal with resonance.
Removing cats: louder, raspier, smellier, more power. But a good HFC will not hold back much power. Catless setups on the street are silly, imo. Usually loud and smelly for no real benefit, unless you like obnoxious volume/rasp (quad resonator setups can mitigate this) and the smell of carbon monoxide. Last edited by wyatth; 01-04-2020 at 01:39 AM.. |
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01-04-2020, 02:06 AM | #19 | |||
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01-04-2020, 05:58 AM | #20 |
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I know you said you wanted more “V8 sound” but ever consider leaving the exhaust as is and focusing on the induction noise instead? Eventuri plenum gives off an amazing growl and the quality/fit and finish is so top notch no inspector would ever know it’s not oem.
Just saying, the S65 has the ability to make the air going into the car sound just as amazing as the air being expelled. |
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01-13-2020, 11:07 PM | #22 | |
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