Hello Vegard_S,
I just bought a 300GD-460 (OM617 N/A) with a rebuilt engine. It runs well on the flats but on the inclines, it tends to slow down a little so I plan to put a turbo on it.
My question to you is did you tune up your IP pump when the STT Turbo was added?
Also thanks for the tips on sound proofing.