I had a problem with blowing out my bypass valve valve gasket and turbo gasket so I removed the manifold and drilled out the 4 bolts for the turbo and installed 3/8 bolts with fine threads to mount the turbo. I also used 12 point nuts to mount the turbo with this give me more room to get at the nuts to be able to tighten them. I have driven the care 20 miles and everything is still looking good and I checked the bolts and nuts and everything is still tight.