Ok i just bought and put on a catback system from zzp and also got the 3in down pipe and the highflow cat and i even got the whisper resonator for those who know what that is and there is still a horrable drone in the car at about 1,800 rpm's and it drones all the way up to about 3,000 but worse at 1,800 even at slow speeds and on the highway any ideas on how to fix this?thanks btw the mufflers that come with their system are flowpro.
Thanks