There are many many debates over these pipes. Im sure if you did a search you would come up with 50 threads. But, I guess it all depends on what kinda motor you got. That dyno sheet is Locogato11283's. His motor seemed to like rockets better, but then again, you could do the same thing on a different motor with different port timing and it could go the other way. I chose to buy Rockets because I like the look of them, and not many people have them. IMO I think CPI's are ugly and plain looking and everyone has them. And some people think Rockets are ugly. Just personal preference really, each pipe will react different to different motors. Both are great pipes.