Hey!!! Any luck in getting an answer to this? I know this is about a 3 year old thread but I've had mine since 2015 and am looking for an exhaust that will fit. All the dedicated ones are either out of my price range and/or out of the country!
Mac Exhausts has a catalog that says the KZ900, KZ1000, KZ1100, and the ZX1000 exhausts they offer will all fit our GPZ900R's but it's the only source I've found for this... If this is true, I'm sure I'm not the only one who'd appreciate the confirmation!
I do like their stuff but I'm keeping my options open for (almost) anything, and again, if there's interchange between those models, it would really help search parameters!