New Supersprint M3 / M4 exhaust sound! The war for the best aftermarket exhaust note for the M3/M4 has begun. So, let’s take a closer look! *Catless downpipes *Front pipes with 2x 100 CPSI metallic cats *Center H-pipe *Rear exhaust with bypass valves *4x90mm chromed tailpipes Leave a Reply Cancel ReplyYou must be logged in to post a comment.
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