View Single Post
      03-11-2012, 03:58 PM   #23
nchan50
Second Lieutenant
7
Rep
210
Posts

Drives: 2009 JzB/FR e92 M3
Join Date: Feb 2011
Location: NJ

iTrader: (0)

Quote:
Originally Posted by kmarei View Post
yes i have
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
I've had the ACM mod for months and there is some slight drone at around 3000-3200 RPM's which is only noticeable in 5th - 7th gears. It really isn't that bad and some people might be more sensitive to it than others. It doesn't bother me (or my fiancee who is hyper sensitive) and the easy solution is to hold a lower gear for a little longer. If you're cruising in 7th gear, there will be some minor drone at 77-80 mph. You could keep it in 6th gear and it will disappear but again it really doesn't bother me. I love the sound of it and don't think it's obnoxious if that's what you're worried about. Just have to hear it in person.
Appreciate 0