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Sounds good, do the H pipe all V8's love scavenging between the engine banks. It will give you a lil more low end but not much and a much happier engine. When you really boil it down i think all that matters is whats best for the truck.

Im 50/50 id go 2.5 all the way back, what i was all ways told is diesel's love to breath more so the a gas engine. IMO i love scavenging, H pipes are good for low end but id consider X pipes to help out on high end. though im not sure if a 6.2 will get high enogh RPM's for a X pipe to do much...