[Info@mad-us.com]

Originally Posted by pbonsalb

In addition, the F90 M5 has a crossover manifold so the exhaust is merged before the turbos. Most aftermarket exhausts for these cars also have an H or X merge, but it is for sound control rather than performance. Generally X is smoother grounding than H. How much the location matters on a turbo car with crossover manifold is highly debatable. BMW put it pretty far back, but maybe that was more for convenience than sound.

Originally Posted by Holset

Yes Bmw is the only manufacturer that has this crossover design they patent it.
Its was introduced on the updated S63 engine used by the F10 M5 its for better evening out of the exhaust pulses for the turbos the N63 does not have it.

This crossover design makes it sound more kind of a mix of a crossplane/flat plane V8 but with a X pipe it makes it sound more like a rumbly crossplane V8 (wich it is) at lower revs and scream more at higher.

Good info here guys