I'm looking at the SuperTrapp article and this is the results:
Stock exhaust and corrected fuel = 36.96
SuperTrapp and stock fuel = 38.82
SuperTrapp and corrected fuel = 39.73
So it looks like the best was remaped box w/supertrapp. I believe they said they used a power commander to remap the stock box. Some of the other pipes used aftermarket fuel controlers and didn't get better results. I do understand that the rzr runs rich from the factory and could see how the exhaust would help. I'v been dealing with Kelly at KMS for a few years now and will call him to see what it cost to remap box, or do we have to actually purchase the power commander.