You can see Prod. Date 2018-10-11 thats why it's a "k" I think
https://www.mdecoder.com/decode/w000047
it may be development cars, test cars in concession, or simply racing cars.:dunno:
Air /water is confirmed:
http://www.realoem.com/bmw/enUS/showparts?id=DB43-USA---J29-BMW-Supra%2040i&diagId=11_7908
I have the same question why the exhaust manifold was water cooled :dunno:?
For the engine
For the B58b30
Built BMW B58 Engine for 1000Hp
Forged Pistons - Custom Compression
Forged H-Beam Rods
Stage 3 CNC Port & Polished Cylinder Head
AMSE Ductile Iron Sleeves
AMSE Coated Rod & Main Bearings
For b58b30C
Same rod, Coated Rod & Main Bearings than B58
New piston and...