[BMRLVR]

To all the people that are condemning this engine since it is based on the N55, Just wait and see.

Some amazingly good engines are out there that are based off of mass production engines.

For example:

BMW S14 > BMW M10
BMW S38 > BMW M88
BMW S50 > BMW M50
BMW S54 > BMW M54
BMW S62 > BMW M62

GM LS7 > GM Gen IV LS (available in everything from corvettes to pickup trucks)
GM LS9 > GM Gen IV LS (available in everything from corvettes to pickup trucks)

Ford Coyote/Road-Runner > Ford Modular engine (available in everything from mustangs to pickups)
Ford Trinity (2013 GT 500 Engine) > Ford Modular engine (available in everything from mustangs to pickups)

Basically what I am saying, is that as long as you have a good base to start from, an amazing engine can be made from a run of the mill engine with some changes and tuning. The N54/55 have proven themselves as good blocks to make good power from, if BMW M wants to make a performance version of them they can definitely do it without an issue.

One other thing that using an existing engine to build on is, a lot the durability testing of the design is done by the drivers that are running these engines in their 335's, 135's, 535's, Z4's, 1M's, X3's, & X5's day in and day out!