I wasn't refering to the duratech, i should have clarified I was talking about DemonSVT's comment about 4 bangers running 20 lbs. to even run 10 lbs i think that would require some beefed up gaskets, Ti valve springs and of course LC pistons. My buddy with a 95 cobra blue a head gasket running 10 lbs on a jackson racing s/c. I don't know the compression on it tho, might ask Rara. But thats the beauty of the turbo, change the boost on the fly smile I would just be careful, cuz its better to loose a race then boost within whizzing distance of blowing a gasket and messing your sh*t up.