Quote Originally Posted by dsp26 View Post
on another note though my car feels like it struggles and i rev it past 6krpm despite feeling stronger than stock.. i've always had the suspicion that the dc2r muffler i have on the car is causing a massive restriction or it's just shot because of the horrible sound it makes.... i know a backpressured system also heats up the engine a lot more.. could this be the issue?
nothing to do with it. I ran a stock vti muffler , twin loop copy and now a EP3R muffler...all run the same mph and similar ET down the 1/4.
FYI my ep3r muffler , on back off makes a terrible noise too...more than likely loose matting inside or rusty bits flying around etc