Quote:
Originally Posted by whataboutbob
I've got Tomei EL, Invidia: overpipe, ft pipe w high flow cat, and N1.
|
The exact quote I got from delicious
"The Q300 could be causing excessive back pressure for a multitude of reasons, but is most likely due to the design of the muffler/piping rather than the size of the piping itself. Reinforcing that is the fact that the OEM catback is actually slightly smaller in diameter than the Invidia and other 60mm systems, yet has no issue with backpressure waves. "