Put on Exhuast and some probs now

[SpoolN]

I put on my full apexi n1 exhuast from turbo back the other day and when im on it around 5500 to 6000 rpms it starts to pop almost sound like its backfiring very quicky and it will do it till i let off the gas. What could this be and should i worry about it. i have the evo 16g on my car to . any info will help rest of my mods are in my signiture

 

[jott5555]

dude my car does the same thing. i got a datalogger commin to tell me whats goin on but i sure cant for the life of me figure it out its only in 1st gear too

 

[SpoolN]

Yea let me know what u find out. I have an auto and i notice it most when i have od off and im in 3rd