ok i dont know what my car should sound like when its at idle..ive got an fc but it has a stock exhaust so i cant tell what my fd should sound like.

there is a catback apexi exhaust with a m2 dowpipe and a uknown midpipe when i start it up it idles around 900 but it kinda sounds like its misfiring my idle doesnt fluctuate and when i start going through the rpms its sounds normal.

is there something wrong with my car or is it suppose to be like that?

 

Is it ported?

 

nope