So it all started out with a resonator delete and then it kept going to straight pipes. After me and my buddy got it done we took it out for a drive and holy **** it is LOUD. But when i launch or just got up to high RPMs i miss fire. Would this be related to not having enough back pressure?

P.S Here is some pics and i am not keeping it like this i am getting a magnaflow..... when i get the money. The first pick is of the mock up and then the second one is welding yess soo much fun with the worst welder ever!!

[IMG]local://upfiles/40373/545017406CEF4F7B9176A4029A79D635.jpg[/IMG]

[IMG]local://upfiles/40373/A183126B0FCE4B3093F22FA4D6D7A82A.jpg[/IMG]

 

Post the VAG COM data:
Fault codes
data block 32
data block 1 & 2

 

ive had straight pipes for a while now and i love it. the only time my car backfires is if i down shift from 4th to 3rd at about 35-40mph i get a loud pop. i like how it sounds straight piped, i wouldnt mind a little quiter but i love that tone the car has now.

 

could just be a coincidence, but like tech said get the codes pulled..... also is your cel on and flashing