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      10-11-2012, 10:02 AM   #4

CombatNinja's Avatar
Drives: e91 328i, e90 328i, e90 335i
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Let's look at this logically: if this caused some sort of damage to the engine, how do you explain thousands of N54/55 cars with aftermarket exhausts running for years without issue? Or better yet, explain the factory approved Performance Exhaust that has no flapper valve.