View Single Post
      04-29-2012, 07:48 PM   #26
GTM_Challenge's Avatar

Drives: E92 M3,X5M,F30 335
Join Date: Jan 2010
Location: Chicago

iTrader: (7)

Send a message via AIM to GTM_Challenge
Originally Posted by KEYON View Post
Very interested to see how it sounds without an x-pipe.

Here is a new video from today with the Challenge Rear Section Exhaust with stock X pipe.

I also recorded decibel readings for numerous situations. If we are able to get our hands on a stock M3 this week, ill get some stock baseline levels for you. All of the levels are very reasonable on this exhaust

All db readings were done at the industry/legal standard outside of the car:


4,000 RPM: 84db
5,500 RPM: 87db
7,000 RPM: 91db

In car

30 MPH Cruising: 53db
65 MPH Cruising: 68db
75 MPH Cruising: 71db
Full throttle 0-60: 71db max

Here is the same exhaust, but with a Challenge Race X Pipe installed for reference: