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I have heard of and seen this mod done before in the past, but not on a Boxster. I've actually seen where people open up their MAF body (this was done on a supercharged vehicle and everything was opened up as much as possible) in addition to intake kits and a larger throttle body. The idea being that the more air in and out of the motor the more power.
However, despite the theory of more air in and out, the more power, I have experienced where the exhaust on a 4 cylinder (Nick, the red 240SX with the turbo) when opened up to 3" all the way (new header, and full exhaust) actually dropped the power (theory that there wasn't enough back pressure?). This was done before the turbo was added to the car.
I'm hoping MNBoxster can chime in here and explain some stuff...
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