I just recently got rid of my 07 speed3 and I can tell you theyre quick even in stock form. I kept up pretty well with my friends evo x stock 3rd gear pulls. Injen and aem cais net around 20 to 25 whp let alone a tune and exhaust mods. It wont get to 400 hp reliablly but 300 whp is very cheap to do with even more tq in a car that weighs 3150 lbs. I think our cars top end especially with intake and exhaust would overtake the mazda modded when it came to rolling race. Hands down would win from a stop with the mazdas fwd and 1st/2nd gear tq limiters.
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