Im sure many of you run HKS catbacks (ie CarbonTI or Hyper) and the HKS Downpipe. So what kind of cat do you use or recommend? Because the catback tapers and the dp is less than 3'', would a 3" cat do any good or any bad, or nothing at all? Or would another sized cat or even the stock cat be better? thanks for the advice!

 

HKS makes one if you want to stay with the HKS setup

 

No one with the HKS setup have any thoughts?

 

Where can I get an HKS cat? I've never seen it on any vendors' websites. Has anyone tried port matching the stock cat to the HKS downpipe and cat-back?