These look great and I like the fact they are road legal. The add for the evo 2 model says.... "E-approved and fully road legal in Europe - designed to work perfectly with stock fuel and engine management settings for true "plug and play" performance - with removable db baffle for improved performance & more agressive sound. E-approval papers supplied." Can anyone explain how if it is decatted, it doesn't need a remap ? I don't want to fit a power commander. I'm going on the theory that the akra slip on that Honda supplies in the Sport Pack, has the cat etc so they don't need a PC. I guess it might benefit from one in terms of throttle snatch, but It surely wouldn't run lean without one (warranty etc) Some info here http://bsd.uk.com/2011-honda-cbr1000rr-with-power-commander-pc-v-dyno-and-set-up/ http://bsd.uk.com/2011-honda-cbr1000rr-pc-v-dual-map-switch-setup/ Second link is Honda akra sport pack..