Wandering if anyone can lead me in the right direction. I just put a yosh rs-3 full system with a pciii usb power commander and a K&N air filter on my 05 busa. I loaded the 312 map from the powercommander website that says it's for an 02 busa which was all I could find at the website for the yosh system with the aftermarket air fliter. My problem is after doing all this to my bike it's back firing at the lower rpm range (1500-2500 rpm) usually when I'm down shifting from 2nd gear to 1st gear and it's never done that before. Any help would be greatly appericated.