Remember guys , he has a 2.2L motor.
IMO, i would go with 2.5in exhaust if you plan to not go inside the motor. If you plan on just having a peppy little bolt on car, then there really isnt any reason to go to a 3in. now if you plan on doing cams and a bigger header like 99SI said, 3in is where you need to be at. but if you dont decide to do that, i cant really justify you doign a 3in exhaust unless you plan on going turbo in the NEAR future.
However, there are major sacrifices when running a 3in exhaust with a N1 muffler, make NO MISTAKE, IT WILL BE LOUD.
I will prob run a 3in exhaust on my 2.0l 12.5:1 LSVTEC. but its a race car.
And the thing about backpressure is horseshit. i made more power THROUGHOUT the power band open header than i ever did with an exhaust on the car. i have also done dynos of cars WITH and exhaust then done it open header, the gains or difference were MARGINAL at best (IE 1whp) between the two.




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