Originally Posted by Andrew@ActiveAutowerke
Depends how picky you are.. When I had a 328 it was straight pipes and I never really noticed any annoyances besides the rear ac vents and rear tray vibrating which was an easy fix.
What size piping would you recommend if i did decide to straight pipe it? (starting after the sensor between cats) and would any error codes show? and what is the outside diameter of the tips you guys have? i really like how they look and i would love to order 4 to run on mine