So im thinking of swapping my exhaust,im running the Agency Power Cat-Back Ti..Im getting the HKS Hi-Power exhaust..My Question is would i need to Retune my car again???Thanks

 

I wouldn't think so, but if you're CURRENTLY pro tuned, specifically to that set up? Then I might get retuned, just for giggles, and for safety, depending on how tight your tune is. If you were on the edge of knock or something with your tune, and your new exhaust flows a bit more air? Meh, could get snarky.

If you're running like Cobb Stage 2 or something, it'd be more flexible.

If *I* were you? I'd do some WOT logging beforehand, then do some WOT logging afterwards, see if you see any differences.

 

Just changing the cat back, the answer would be no.

 

Yes sir just the catback..Thanks