Inlet diameter should just match with the BMW performance exhaust. The tailpipe trim of the performance exhaust is a bit smaller than the OEM one but I think that the inlet diameter of both is the same (I'm not sure).
Well, actually you offer a stainless steel tip which must be welded with the exhaust. This tip is surrounded by a carbon tip. What I asked is the diameter of the inner tip (e.g. 3.8 inch)? IMO the carbon tip has 4 inch. Therefore, the stainless steel tip must be smaller.
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