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If it matters to some, I have this exhaust and with the cat delete pipe I got 12.5 rwhp and like 4 lbs tq, loud with no cats though.
2005 White Water Pearl 6 spd Touring with...
Cobb AP, MazdaSpeed Front Clip, Agency Power 3" cat-less full exhaust, Mazsport Ignition, Drilled and Slotted Rotors with Steel braided brake lines, Tokico D-Spec Adjustable Shocks & Springs, AP Underdrive crank pulley, K&N Drop-in filter, custom round wheels and square tires...