i have these installed in my car and i only got to drive for 1 block (moved to new house) before it snowed and i really got a chance to do anything to the car. this was after i did a total tear down to the chassis and painted and rebuilt the car. some of you may seen this on the "evil forum" as my build up thread. but when i drove the car it almost sounded like a grind in the tranny? it didnt grind before the tear down and i might have mislead the noise for vibration since when i did give the car some gas it made a decent amount of vibration. i was hesitant(sp?) about my clutch install and thought i messed it up by installing it backwards and couldnt get the car to move or go in gear. it turned out to be the clutch pedal needed adjusted. fixed that. now i need to know if indeed these make your car vibrate enough to cause noises you wouldnt expect?
BTW:
a 4 inch DP, 3 inch test pipe (hollowed cat) and 3 inch exhaust didnt help matter either!