Thread: 328i M peformance exhaust hp gains?
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      05-26-2014, 11:22 AM   #12
rustyminded
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Drives: BMW 328i
Join Date: Nov 2012
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Nope AA axle back is catless which I experienced & notice a huge difference in torque, axle back is worthless if it's catted but catless will make a difference.
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