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03-11-2012, 11:50 AM | #3 |
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I've heard both in person and they sound 97% identical to me. The slight difference is due to the type of metal used. I DJed for 10 years and have very sensitive ears and could only tell a slight difference side by side. If they weren't side by side I wouldn't even be able to tell that side by side.
I posted in another thread earlier today, but over the weekend I discussed my Auto Couture Motoring exhaust mod with a BMW representative/enthusiast (who is on the forum, but wishes to remain unnamed for obvious reasons) and he assured me that design wise the ACM mod is identical to the M Performance Exhaust. The M-Perf uses a slightly lighter material, but for the $3000 difference I can live with a few extra pounds - the ACM mod doesn't weigh any more than stock |
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03-11-2012, 11:55 AM | #4 |
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There are a few different schools of thought on what exactly the OEM mod entails, I would review the few options available - you'll find them all on the forum.
My experience has only been with the ACM method |
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03-11-2012, 01:30 PM | #7 |
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and the associated weight loss from your wallet
might help your lap times
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03-11-2012, 01:33 PM | #8 |
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http://www.m3post.com/forums/showthr...1#post11521969
check out our official thread, videos are good, sounds better in person though! |
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03-11-2012, 01:54 PM | #10 | |
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Quote:
that's assuming you do the old style not the ACM style i've heard both mods original mod sounds stock at idle, only sounds loud after about 3000rpm ACM mode sounds loud at all rpm and will be easily noticed and drones big time
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03-11-2012, 02:29 PM | #12 |
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I did the "old style." It's perfect for my requirements--no drone, and not sound stupid loud all the time.
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03-11-2012, 02:32 PM | #13 | |
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what drone are you referring to, ours doesnt drone?? have you heard it in person |
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03-11-2012, 02:33 PM | #14 | |
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Quote:
acm style is stupid loud
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03-11-2012, 02:52 PM | #15 | |
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Quote:
i heard both the original mod and the acm mod 2 cars, right next to each other one had a very noticable drone (ACM) one didn't(original mod) and the owner of the ACM mod car said the same thing on the highway the drone is very obvious, past 3000rpm how can you not have drone on what is essentially straight pipe? the acm style doesn't pass through the muffler box at all
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03-11-2012, 03:06 PM | #16 |
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+1..went with the original mod of removing only the large perf pipes..left the small pipe uncapped..easier to do..no drone..imo its more civil ..the straight pipe method is waaay loud.
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03-11-2012, 03:09 PM | #17 |
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thing is i like loud just as much as the next guy
but when you are on the highway, doing 60-70 for 20-30 minutes on your way from or to work. and in the backgroud there is a voooooooooooooooooooooooom sound is gets on your nerves and its annoying to you and the passengers but if you are at a parking lot showing off to your friends on how loud it is then sure loud is good
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03-11-2012, 03:17 PM | #19 |
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I just did this mod yesterday myself. Cut from top and tig welded it back shut. No way to tell unless you pull the muffler back off and even then if you do it right and dont have another one to compare to, you wouldn't know. (I didn't "bubble gum" it all up with a mig welder ).
All the reports are dead on. Either cover or replace the long section of perforated pipe and leave the short section alone, leaving the steel wool. Car sounds normal at idle. Tone is the same at higher Rpms, just more volume.
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03-11-2012, 03:20 PM | #20 |
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All I can say is the original version of the exhaust mod, with all the pipes covered, was really quiet. I hardly noticed it at all and was really bummed. I would think the ACM would be perfect, similar to the M performance or Dinan in sound levels. I think ACM also keeps the hemboltz chambers intact so between that and the cats/resonators it should be civil.
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03-11-2012, 03:52 PM | #21 | |
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03-11-2012, 03:56 PM | #22 | |
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definition of drone?
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I was told and from what I've read online, that "drone" means vibrations. Can anyone elaborate on this?
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