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BTW, does anyone know if I run N55 midpipes w/ PE on a N54 135 if I will pass emissions? If I understand correctly, the only difference between N55 and M54 midpipes is N55 midpipes doesn't have cats. I'm planning on moving in 1.5 years and I really don't want to put the old N54 pipes back in the car just so I can register the car in another state and put the N55 pipes back.
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