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Originally Posted by Piets94
I'll try for some pics later on, but there is no difference in pipe diameter at the connection between the mids and rear - it's 76mm. This goes for both OEM/N55 and the HMS mids. The only difference is in the flange design - HMS has a solid flange, OEM is rolled and thinner.
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Did you use the original BMW donut gasket between the N55/HMS sections?