Originally Posted by matty.dc
The available option for me was to go with stock 10.5:1 or the JE 11:1 Comp ratio. For you on the m52 it would've bumped the c/r from 10.2:1 to 11.5:1 which is a bit bigger jump in compression then I would've received so it really wasn't worth it.
That 11.5 would have been a suitable improvement, but I couldn't find a source with that C/R piston.
CP has them I'm pretty sure (VAC). Both CP and JE can also do custom, for about $200 more than off the shelf.