Just a heads up, I bought a new/stock zx6r 98-02 can on Ebay with the intent of cutting it down and making a diy shorty for my 03 S4. After chopping a bunch of it off, tried a test fit, the factory hanger brackets don't match up. there's about an inch difference. That explains why aftermarket pipes work, they have straps that are adjustable. So, now I have to decide whether to grind off the zx6r bracket and use a strap, or finish the pipe and ebay it to someone with a kawi. thought this might save someone the same trouble.