your sooo lucky you can mount your 2.2G tank/ in that location!!! I have a "hump" there for whatever control unit.
I'm not fond of the new Cooling Mist solenoid plastic fitting either! Or the one on the pump, but so far I haven't had leaks from those locations.
E90 LCI M3 7-DCT Interlagos Blue/Novillo Silver
[MS Pullies|K&N drop-in|Test Pipes |Evolve Stage II tune|Evolve Servo Map|Evolve M3 GTS-DCT file]