I'm selling my friends old exhaust off his Honda F4i 600 for him. Its a Yoshimura RS-3 Stainless Slip-On for 01-06 Honda F4i and I think it will fit the CBR 600. But the muffler portion will fit most sport bikes and you will just need to buy or get a mid pipe made. It is in good condition except for a few small dents. He is asking $150 plus shipping.