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Actually it could hurt the car if you open up the exhaust to much especially since it is off a turbo'ed car. You will lose the performance the muffler was intended to get. I noticed with my exhaust i lost a good bit of torque at lower rpms. Bigger isnt always better. Is this a stock single or dual exhaust?
But it won't do shit for you because its a TURBO exhaust. Backpressure lol
This.
This would be almost as dumb as when I put a 3" Apex-i GT Spec cat-back on my non-turbo FC RX-7. But then again, at the time I was 15 years old and I got the cat-back brand new for like $350, so I couldn't pass up the deal. It was loud as fuck, but it probably hurt my performance more than it helped. So thats my excuse.