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If it's a straight-through muffler there should be like zero restriction.
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'02 ///M5 Imola Red / Imola Red '09 335i Alpine White / Coral Red
Past:
'04 E55 AMG Brilliant Silver / Anthracite
'96 318i Alpine White / Black
'01 330Ci Titanium Silver / Coral Red
'96 328i Jet Black / Black
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