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A bigger turbo on an engine that can't handle more than 12 psi is pretty much pointless. The GM-X series turbos work well for what are designed to do, but the hard 90 in the exhaust housing is very restrictive. My exhaust was cheap mod that improved low end spool tremendously. It would't work in...

IMO, the only way to truly utilize a 4" or bigger system on a 6.5 turbo is to replace the housing of the turbo. I built a custom rear housing out a peice of 4" mandrel bent pipe and made a 1/2" thick flange at work. It required running outside of the frame rail and considerable clearancing of...

You're going to have to modify the down pipe on a 6.5 setup anyway to fit your truck, but the inside of the turbo exhaust housing is only a little over 2.5", so going a whole lot bigger afer the downpipe on a 6.5 turbo only helps very slightly. In others words, going to a 3" or 4" system using...