Mocking up the engine and turbo headers. I think a mistake I made before was to only support the turbos with just the header flange. No wonder I had exhaust leaks... duh... Now I will support them at the front of the head and at the turbo itself. Some of you very observant folks will look at the engine at go.."those are LS1 headers!" Well, your right. They have better flow, and the bolts are not jammed right up next to the tube. The new bolt holes are into the water jacket, but modern sealers will have no problem keeping the water in.