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great DIY and information as always dack.
I have a question. Whats the difference between this and getting a muffler shop to just cut out the secondary cats and put a small tube in their place?
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2009 128i Coupe Crimson Red  MODS: -Injen Intake-Magnaflow Exhaust-Carbon Fiber Spoiler - Carbon Fiber Grilles - OZ Ultraleggeras - CF Mirrors |