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Originally Posted by ///AVM
So
Someone asked if MPE is associated with modest power gains? I'm not sure but, if it is, the gains are not appreciable to my senses. Also, what the weight difference is between stock and MPE? Again, I do not know the specific difference, only than the stock exhaust felt much heavier when physically lifting.
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From what I understand, the only difference between the stock and the M Performance exhaust set up is the usage of a scant amount of titanium and less sound insulation. There is really not much more to it.
As far as the MP being lighter, I haven't personally measured the weight difference but logically, I'm going to assume it's not a significant reduction in mass or else BMW would of plastered this fact, front page, on all their promotional material for this item.
Here a cutout of an M4's inner exhaust barrels, compared to, side by side:
M4 Stock Exhaust => M Performance / How Inside Change ?
https://f80.bimmerpost.com/forums/sh....php?t=1510212