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well the over cfming would do it.
when you over cfm your engine your going to make your bottem end all soggy and its like your eninge is bogging. though when it hits the higher rpms, heeeeelllllllo elvis.
as for the exhaust 2 1/2 shuodl work and the 1 foot of 3inch won't kill you but your losing back pressure (back pressure:awsome for torque, bad for hp), depends how you want it, low end car - a good amount of back pressure, high rpm/hp car - low back pressure
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