Check out
http://www.m3post.com/forums/showthread.php?t=493092 and
http://www.m3post.com/forums/showpos...&postcount=212.
For people who think the M Performance Exhaust is expensive, think again because it is made of Inconel, which is the exhaust material used on F1 exhaust. And the tips are polished titanium. The major benefit of MPE is weight saving at least 20lb, other than that, sounds similar to perforated OEM mod but resonate better.