I do not know!! I know that from the factory (choke) the power of the bike, to pass some tests to enter production, ok but I put on my Z1000 08 full exhaust Akrapovic, filter, oil, spark plugs and brain PC3 And I got almost 9hp!!!!!!!!!!!!! and you got 20-25hp!!! probably the magical fuel !!!! the improvement of the engine which was the passage of time in Z.(Sorry for my English)

is that a full system (with cat removed) or just a muffler?

Hey is Carter still offering test rides? I was at carter a few weeks ago but at the time I was in the market for a Kawi 650, but my research has led me towards the Ninja 1000, and I would love to test ride it. I'm not a pro-rider but I have an 03 Katana 600 that I need to move up from.