trying to fit a md321h to my v7 sti, how much gearbox casing do you need to grind away to allow clearance. i,ve had the turbo on and off 5 times today grinding away a bit each time, its now doing my head in help please. i,ve nearly ground through to the gearbox mounting bolt already!

 

Fit an MD321T to my STi 5 a couple of weeks ago.

I had to shorten the bolt slightly as i needed to grind that much of the casing away, helps to mark where the turbo is fouling on it.
Pretty obvious but be careful not to get any **** near the oil supply and return pipes.