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Well, the M Performance exhaust is not the one of the M3 GTS, that has a titanium exhaust, because it is simply to expensive. It will be different.
Boysen is not an aftermarket company but a car supplier, that is why you will not be able to find any info or buy the exhaust from Boysen directly.
Exhausts:
M3 GTS: Boysen (supplier)
M3 GT4: Akrapovic (after market)
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