Thread: Exhaust Question - Magnaflow N54 to N55?
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      05-13-2011, 12:54 PM   #2
Brey335i
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Drives: e46 ///M3
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Looks like the N54 unit is designed to keep the stock secondary catalytic converters and slip on right after them. And the N55 doesn't have secondary catalytic converters so it bolts straight to the downpipe.
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