Thread: HFC
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      12-14-2012, 02:07 AM   #6
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Drives: '15 FO M4
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2011 BMW E90 M3  [4.72]
Originally Posted by Space Ghost
I was catless with my AA exhaust and switched to HFC. I like the exhaust tone better, no smell and only lost a little power in the upper rev range. Plus gained a little torque down low. Perfect trade off for me.
+1 did the exact same thing and feel the same way
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