C63s pure 900 vs E63s twin scroll turbo and manifold
I considered the same thing for the benefit of a twin scroll setup, but I don't think the benefits outweigh the costs.
I gave it a serious consideration, but after researching the cost for sourcing E63S exhaust manifolds and the turbos, it didn’t make sense to go down that path when you have plenty of stock frame turbo upgrades that make more power than the trans can handle.
The other major deciding factor in not going down that rabbit hole is that the E63S twin scroll setup will hit even harder down low than our small stock turbos do, and that torque down low doesn’t help with traction - you’re better off shifting that torque higher up in the RPM band for the sake of traction.






