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02-26-2019, 12:29 PM | #2 |
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AutoCouture!! 201-666-3500
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02-27-2019, 07:22 AM | #4 |
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There's two ways we have done the ACM exhaust since we created it almost 10 years ago. There's our normal method on the outside of the canister, and then there is the "perforated" variant which was cutting and modifying the long middle section of the canister (looking at it from the top). Naturally, we experimented with both to compare sounds. That center work was twice as long with literally hardly any noticeable difference in sound. To charge people for twice the work for an outcome that wasn't to our standard in sound, we decided to no longer do it. We've also only done maybe a handful of the perforated version compared to hundreds and hundreds of standard ACM mods.
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02-27-2019, 03:42 PM | #6 |
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__________________
2009 335i xDrive 6MT // Black Sapphire / Cold Weather / M Sport / PDC / Premium Package / Aerodynamic Kit / Anthracite headliner / Keyless Entry / AR Design Catless Downpipe / Style 313 19" Wheels/ OEM Euro Taillights / LUX H8 160
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02-27-2019, 05:35 PM | #7 |
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02-27-2019, 09:01 PM | #8 |
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02-27-2019, 09:52 PM | #10 |
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02-28-2019, 07:58 AM | #11 |
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02-28-2019, 08:46 AM | #12 |
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02-28-2019, 07:27 PM | #13 | |
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OEM Mod (4 pipe) and rogue engineering catless test pipes are a great sounding setup. I ran this setup for almost 2 years. Loved the sound. IMO, if I could do it all over again, I would start with a full x pipe, specifically the bimmerworld catless x pipe which is what I have now. I got an insane deal on it over the holidays and really makes the S65 sound exotic. Paired with a Corsa motor is pure bliss. |
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03-04-2019, 09:27 AM | #15 | |
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Stock Exhaust: Cold start:90db Idle:73-75db Oem exhaust mod (non perforated) = 90-92 db cold start 78-80 db warm idle obviously one would hope they have also measured it when it's on throttle... but i'd say 4pipe about 20-30% louder would be the right ballpark. also, qualitatively, no one ever commented on the noise before i did the mod but after mod it gets complimented all the time... you can also find a lot more comments / opinion on acm v.s. perforated pipe mode in this thread: https://www.m3post.com/forums/showthread.php?t=980085 |
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03-04-2019, 01:52 PM | #16 |
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Wally I'm in South Jersey and offer to meet up one day so you can hear in person. I have (I believe) the 2 Pipe perforated by ACM mod. I say believe because I bought the car and the center of the muffler (looking down from top) is welded, so this is not the ACM bypass else the two outer sides of muffler would be welded.
The car was from NY area so my guess is that Autocoture did the job. I have AktiveWorks test pipes and IMO the combination sounds amazing! Quiet when needed but when you drive spiritedly it roars - not ricey or tinny, but deep and exotic. Again, to me its 100% perfect. Doug |
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03-04-2019, 03:01 PM | #17 | |
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03-04-2019, 03:12 PM | #18 | |
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03-04-2019, 08:26 PM | #19 | ||
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03-05-2019, 06:38 AM | #20 |
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03-05-2019, 10:02 PM | #21 |
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More in central nj but check out Bimmerclinic in Rahway nj. Speak with Bill. Great guy.
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