Quote:
Originally Posted by ndinh
Don't think 4" tips will fit on that diffuser. You'd have to go OE or something made for a M5. I tried M5 mufflers with a standard dual opening diffuser and it touched the diffuser sides. I ended up selling the setup and going with 3.5" tips.
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From the measurement's I've taken, that diffuser has wider openings than the standard 550i diffuser (by about half an inch) I know that the 550i diffuser is not really a good fit due to the trapezoid shapes.