db killers

hi fellow dukesters, just fitted round style akras to my 07 duke do db killers effect performance? popped mine in got a few warnings from plod already they do sound mint with them out though !

I have the round Akras on an 05 model and had a custom map done with them in and out.. only difference in performance was in the VERY low end .. by 4,500 everything comes together and there is little between power/tourque for the remainder. From the seat of the pants i think the bike has a little more initial kick with them out .. and for "safety" reasons I run them out most of the time .. if they can't see me they'll certainly hear me