Quote:
Originally Posted by johan
^this
It's not wise to leave a close coupled cat in place with a supercharger. Just swap that out and leave the overpipe, front pipe, catback stock. I have my 2017 with a Tomei and Harrop SC and aside from the cold start, it sounds almost as quiet as stock - even with the blower.
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Why is it not wise? I've seen a few threads on here showing little to no gains between stock and aftermarket headers on a supercharged FA20.
I can tell you that my HKS EL catless header with the stock FP is noticeably louder. I have the Vortech SC installed and I'm seriously considering going back to the stock header to make it quieter.
To be fair I have the RS1 quad tip exhaust which was pretty loud even with the stock header.