Update time.
I am still working on the Turbo setup.
I realized I had to modify the Wastegate. It has a very visible place in the engine compartment and the Fujimi kit has the stock F40 wastegate:
Which doesn't look anything like the F40 LM wich is much bigger and polished:
I began with cutting some pieces of aluminum tubing, and made the flanges from styrene sheet:
And the result after some Alclad II chrome. I will fix the angle later: