Aleromod.com - 2.4 Exhaust piping

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what is the diameter of the stock exhaust piping?

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2" i do believe.

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Inner diameter is 1 7/8"

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go with a 2.5" if you can get someone to do it, i really reccomend this cause, my cousin has a Cavalier, and before he did the exhaust i would seriously beat him by about 4 or 5 car in the quarter, but once he redid his exhaust it was much more even and closer!

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go with 2.25. with 2.5 on a mostly stock 2.4 you will lose bottom end. 2.25 will free up hp but without losing a lot of torque

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yeah, but once you do some basic bolt ons it will really add up, it is true that you will loose some low end torque, but you high-end really pulls hard!

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The reason for going with 2.5" is because most likely it will be custom or crush bent so it will flow now more than 2.25"
where 2.25" crush bent will flow like 2"

The amount of top end gained will more than make up for the loss (if any) on the bottom end.