The ZX 6 R/RR, Kawasaki s Supersport speedster in the 600 class, is definitely a head-turner. To improve its sleek looks even further we have developed an Akrapovic SLIP-ON SP SERIES system which fits smoothly into the bold lines of the Kawasaki. The Akrapovic SLIP-ON SP SERIES system is designed for riders who are looking for an excellent combination of aesthetics, quality and price. And of course a performance enhancement. The Akrapovic SLIP-ON SP SERIES systems for both the 6R 636 and the 6RR are identical.