The actual tailpipes look the same diameter as standard M3 with bigger tips.
It also looks like the chunky tail box has gone from between the pipes. It would be nice to see it from below.
Shame it's not a full HFC system, just a muffler. There doesn't look there will be any power gains, but it will probably sound pretty good.
Surely a better (cheaper) option is the diy surgery of the stock muffler with nice tips?
If it was a full system with a factory tune, I would be there in a shot.
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