personally I think you guys might be getting a little to wrapped up on the exhaust. I have the HKS Hi-power and it works great. I got 550 hp at 10.5 psi on my car and it is a canned tune from sam. I know when my shop looked at it they said there was easily another 60-70 hp they can get to the wheels. Just didn't want to pay for a full tune.
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