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Discussion Starter · #1 ·
I bought a 07 Mazda 3i with these mods made to it (stock breather with K&N filter, 60 mm throttle body in place of the stock 55 mm, 2.5-inch cat back exhaust system with a through muffler in it). Would a 4-2-1 header bring me more torque in the low to mead of its 2.0-liter engine?

Thank you for your time,
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