I'm considering exchanging my #5 plate with a #4. What I believe this would lead to is the need for other mods. such as turbo housing etc. See signature. Presently I can tow 7000 lbs. up relatively steep grades and the EGT's top out at 1050 deg. or so. The top end peformance of the #5 is great, but the low end is not much stronger than stock. Any thoughts, and is there more I should be concerned with than EGT's and a turbo housing? Thanks