Thread: n55 Exhaust mods
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      07-09-2010, 11:47 AM   #17
RyanMv4
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Drives: 2020 440xi
Join Date: Jun 2010
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Yeah i guess if theres a primary cat on the downpipe the cat delete is the way to go... Im guessing its the 600 cell count because from what I can see they are the exact same size at the two secondary cats on the n54 exhaust systems ...
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