Here's some more he351 6.5 related info.
http://www.dieselplace.com/forum/63-gm-diesel-engines/21-6-5l-diesel-engine/470-6-5-6-2-high-performance-engine-modifications/442833-he351ve-observations-questions-answers.html...
What style waste gate are you running now? If you still have the stock one that came with the turbo, it's set for 20psi and can't be set lower. I think that setup will only allow increased boost. Might want to start with a waste gate pot set at a lower pressure and adjust from there.
There are muffler delete pipes, they can be had in single 4" inlet into dual 4" outlet. Had that on my truck with a d max driver side pipe from a dual outlet kit. No muffler and it was super load, so loud I went back to the single outlet setup
If I were you I would search for dual cat back...
I don't understand why non of these vendors post cam specs. How is one gonna know it's what they want with out at least knowing some of the numbers?
The specs are readily available if your buying any cam for a SBC for example. It's so people know what they are getting and can decide if its...