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Discussion Starter · #1 ·
I'm thinking abought putting a 4-2-1 header in a 07 Mazda 3i my brother gave me. I already put a K&N filter in the stock breather, 60 mm throttle in the place of the stock 55 mm throttle body, 2.5-inch cat back with a straight through muffler in place of the 2.0-inch stock cat back. I was wondering if anyone could give me an idea of how muck hp I might get by adding the header along with the rest of the mods?

Thank you for your time,
Daniel
 

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2012 Mazda 3 GX MT5 non sky
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As mention by @Alian ... dependent if your engine not losing or lost power you will probably add about 25-30 HP with a tune to maximize that set up
 
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