ndiggles thanks that was a really helpfull post. I am running an l20b yes, with a tdo4 wrx turbo, slightly smaller than a t28 more a t25 id say. The ecu does run a map sensor and i think the cac at idle was around 20 ish maybe a bit less, didnt pay much attention. When the cam lobe is pushing all the way down, the outer spring is not binding but would be getting close maybe 0.5 -1mm clearance so im assuming the inner spring would to be ok. Yea it runs a tps 0-5v and im positive that the cam chain is on the right gear teeth! The problem would be that since i dont have an adjustable cam gear the cam positioning would be as they ground it sinse the cam locks in to the gear pin etc. Do most regrinds grind them so you can just put them in (assuming you set up lash pads, coil binding etc) or is it expected to use adjustable cam gear and cam dial gauge etc? Thanks fellas, its in the w/shop atm for a retune so ill see how it goes and recheck everything when i get it back. So a more wild turbo grind would leave the exhaust and up a few inlet grinds?