crawldad91, Akhor,
My experiance with all of my RB engine is that use the RB pipe that they suggest for your engine. Basiclly almost all RB engine will want either a 2020 or the 2045 pipe. The JP-1,2,3,4 pipes made the engine run hot. I had a WS7III that would run 260 to make any kind of power, but was concerned with the temp. I went to the 2045 with a 198 header. Engine had all the same power ans got better fuel milage and would run at 190-215. My C6 was the same way. The 2045 is the best combo with any RB engine in my opinion.

Chuck