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I have a 07 Mazda 3i with (K&N filter in the stock breather, 60 mm throttle body in the place of the 55 that came in it, 2.5-inch cat back system with a straight through muffler in place of the stock system). I hope one of you could give me an idea how much more horsepower it puts out on top end with the mods.
Thank you for your time,
Daniel
 

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Only way to tell is if you get a dyno reading. Most areas have a shop that has a dyno.
 
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