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the exhaust had nothing to do with it... if anything you liked the sound a little to much and had your foot in it more often.... 6.0's are very prone to warping heads and blown head gaskets.... the egr valve allows superheated gasses into the intake and has to cool them down, which in turns superheats the coolant which like any liquid expands.... under normal conditions this wouldnt be a problem, but international in their infinite wisdom decided that the 6.0L only needed 10 head bolts per head... comparatively the cummins has one head with 28 and the duramax has 18 per head... this makes the powerstroke heads weak... and will warp and/or crack... head studs will help, getting the heads milled in the process will make sure there is no warping issues... and an EGR delete will get rid of the problem system... a few other weak points to address for you on the 6.0L is the VGT turbo is prone to failure, so a non VGT setup will be more reliable and produce more power... and the injectors are prone to failure as well... so adding a fuel system would be a good idea....
if you need any assitance getting these parts and want some pricing, let me know
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