I have a full Kerker system and K&N filter and obviously run the Kerker full exhaust map right now until I can get it back in the shop for a custom tune. Before I had the Kerker I had a stiletto slip on and had to mess around with different maps until I found one that worked the best. I was still breaking up in the high rpm's so took it to my buddy's shop and he tuned it for me. It ran awesome and then I decided to get a full system so now I have to put it back in the shop before too long and get a new custom map.

 

well i felt that the hindle full system was the best. but after a day i decided to get a custom map. its not perfect but a guy down in arizona made one for me
here is the link F.A.I.C. "Big Pipe"
the custom map is only 50 dollars. For now it is a temprorary map until i really get a dyno tune. just list what you have on your bike.
the guy is an expert and he personally called me within 48 hours.