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Unexpected monkey wrench thrown into the works has put this thread on the shelf. However, the show must go on. Without letting the cat out of the bag the VRP Tri Y (4-2-1) design long tubes served their purpose and very well could be a grave mistake shifting to a 4-1 long tube design. On the other hand, convinced that my steed's new custom exhaust coupled with the tried & true ARH 4-1 design will net faster trap speeds up top on the back half pulling like a bat out of hell taking full advantage of Barry's Hammer Redline on my N/A application; VRP & ARH dyno results will be released later this year.
I think you made the right call on swapping headers and will end up with a higher trap speed what is the new plan for the rear part of the exhaust just full 3inch? also whats your rev limiter set too now?