Originally Posted by KEYON
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
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: