Quote:
Originally Posted by makasu
What is this OEM mod though? I don't mind trying things out!
|
On the E9x you had to replace the perforated section of the pipes with non-perforated pipes or just install a straight pipe (there were 2 version of the "OEM Exhaust Mod"). It looks like the new M3/M4 essentially comes with this setup when in Sport+ mode (ie. the valve opens and bypasses the perforated section).
Here's a thread I started that discusses this, including a diagram so you can see the perforated section:
http://f80.bimmerpost.com/forums/sho....php?t=1004822
If you can somehow leave the valves open all of the time on the new M3/M4 then it will be the equivalent of an "OEM Exhaust Mod".