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If you can find an SLP exhaust for a grand am, that works GREAT...I love mine, but you will need to shave the down pipe a little as apparently the grand am is a lil longer (i dont know how)
TPS-tec is a good easy (cheap) mod, not sure if its a great increase but i felt the difference in mine, though it did go up after 2 years.
if the site is still up PFYC.com (parts for your car) has some decent priced parts for beginning and i havent been on there in some time, but they had a supercharger too.
But like others are asking, your intentions (goal) would also drive you to look 1 way or another.
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