Now im gonna try to actually answer the post.
I have driven an IS 250 when a friend first got it and then i drove it with just an intake after they got it installed. The intake made a significant difference so if you add an exhaust, id imagine even better pull. The car is lighter than a 325 as well. The 325 also only came with 184 horse, while is250 starts with 204. I would easily take the IS 250 in that race
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