Very impressive design. It's nit picking, but I'm not a huge fan of the way the manifold looks from the exterior. Not sure how to improve it, but it has a very unfinished/after-thought look to it.
E92 M3: BPM Stg. 2 | Akrapovic Evolution | Brembo GT | KW Clubsport
E89 Z4 35i: Cobb Stg. 1+ | Evolution Racewerks FMIC | Tial BOV