so i had my local turbo shop put a 3in manderal exhaust system on my car w/ a n1 muff but the damn thing backfires so bad over 3,000 rpms too much fuel or what need help it is soooo annoyying

 

thanks for all the help guys

 

Do you have a resonator?

Mine kinda does the same thing. Downpipe, 2.5" to a Magnaflow turbo muffler, and once in a while it pops.

I think its because we have no resonators?

I refer to the pop as a "Farty Pop"