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Hi, I recently bought my 06 grand prix. I was wanted to do some engine mods to it but nothing crazy. I'm not expecting many gains. Just something to make driving a little more exciting. Does anyone have experience with an air intake and/or an axleback?
I would not expect a lot of performance increase with just those modification, maybe 5 to 10 HP total. A high flow catalytic converter and a reprogramed PCM will do more, but the intake & cat back will also help some.
The programmer can also adjust the trans shift points and increase the trans line pressure, a quicker shifting trans will make the car feel much better. Just my Opinion.
I owned a 99 GTP but have never owned a 2003-2008 GP