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I think the M Performance exhaust part # for the standard diffuser has shorter pipes compared to the exhaust part # for the M diffuser. If you install the M diffuser with the standard exhaust you need to add adapters (part #2287042).
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'17 F80 (RET)
'14 F22 M235i (RET)
'11 E90 335i (RET)
'07 E92 335i (RET)
'89 E30 M3 (RET)
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