I'm disassembling my stock twins to port out the wastegate, but I can't get any of my wrenches to fit on the exhaust housing bolts. The bolts seem to be between 9-10mm or 3/8-7/16. Obviously with these bolts being on the turbo I'm sure they're tight, and I don't wanna strip the heads.

Anybody know what the actual size is? I doubt they're a 9.5mmm.

 

Those are 10mm

 

Mine were a bit smaller, but I finally got them off. I'll be replacing them with proper 10mm's when I put it back together.