For everyone's information. I took in my supercharged, K&N filtered, Big Gun Exhaust Pioneer to the dealer to have the ECU checked and remaped if necessary. It cost $39.00 at my Honda dealer, and they said it was right on and didn't have to make any adjustment's. That tells me that the factory ECU (controller) will handle alot of situations and that high altitude is not something that will require or help having it remaped. Save your money. I've put about 300 miles on my machine since the modifications and it's run perfectly. I had it checked just for peace of mind after all I've done to it .