I have a Werks free-flow cat front pipe behind a Borla header. The Werks gives me a nice throaty growl but not overly loud. There's some drone but I guess I've gotten used to it. it's much louder for the first few seconds after I start it, but then the volume drops. I'm very happy with it. I've had two actually, which I bought used. The first one had the cat come loose and rattle making a lot of noise so I picked up another one. That combination, coupled with my Phantom electric supercharger, gives the car a significant performance boost. I've gone back to 93 octane from E 85 because the 85 was so hard to come by in my area. With the set up I have, I do very well with 93.
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