This GSXR mod works incredibly with the 'BST magic' mods - cheap do-it-yourself mods to the stock DR650. Read about it all in this BST magic thread. This info applies to 1996+ models only. WHY ADAPT THE GXR600/750/1000 & HAYABUSA EXHAUSTS? Most are half the weight of the stock pipe, and similar to aftermarket pipes. Dyno charts indicate similar performance increase as aftermarket pipes. It's far quieter than aftermarket pipes, but still sounds great. It's good for the environment - you are recycling. It never needs repacking. It looks legal - if aftermarket pipes can get you booked in your country, then this comes stamped Suzuki and your average cop wouldn't have a clue. The GSXR exhaust works brilliantly with the carbie mods in this video. IS IT CHEAPER THAN JUST BUYING A POWER PIPE? It can be an incredibly cheap mod if you get the pipe cheaply from the wreckers, and make your own mid pipe. It will still be pretty cheap if you buy an aftermarket mid-pipe and get the can cheaply (say under $50). But the current mid pipes are quite expensive, so make sure you don't pay too much for the GSXR exhaust. HOW MUCH EXTRA POWER WILL I GET? AND WHAT DOES IT SOUND LIKE? Here's a dyno chart that shows the GSXR1000 pipe matching or slightly outperforming the FMF pipe over most of the rev range. Please note I don't know what jetting was involved, the results came from this site here. WHY IS A MID PIPE REQUIRED? You can use your existing header pipe, but will need a midpipe with a flange to connect to the four bolts on the GSXR muffler. You can buy an aftermarket one or make your own if you can access some pipe bending and welding equipment. Alternatively, try an exhaust specialist - in Australia most motorbike exhaust specialists will only charge around AUD$200 to make the mid pipe (US$150). One problem with the available mid pipes is they tend to push some of the longer GSXR exhausts out past the rear fender... ugly and exposed. WHICH GSXR PIPES WILL WORK ON THE DR650? You've got a fair bit of choice here, depending on how fussy you are about size, weight and performance. The lightest can is from the GSXR1000 2001 and 2002 models. This one is shorter and lighter due to a fair bit of titanium. A bit louder than the larger GSXR exhausts. Make sure it is stamped x40F0x. Weighs 4.5 pounds or 2 kg. This is the holy grail, most have been snapped up now. Second best option is the GSXR1000 can from the 2003 and 2004 models. It will be stamped x18G1x. Slightly heavier, longer and fatter but still fits very well. A bit louder than the larger GSXR exhausts below. Third option? GXR600 2001 to 2003 models and GSXR750 2000 to 2003 models. Weighs about 7 pounds or 3 kg. This version has steel internals so a bit of extra weight (but still far lighter than the stock can!) and a smaller outlet pipe so it's quieter and a bit more restrictive. It is stamped "35F01". Fourth option? Old Suzuki Hayabusa cans, stamped 24f0. Weighs about 7 pounds or 3 kg. Plenty of these around and each Busa had two! These have a high volume and good sized outlet designed to let a lot of exhaust through, so very good performance but also a quiet exhaust note but much deeper sound than stock. Other options include getting aftermarket GSXR pipes, although the problem here is they are often very loud with no power advantage, and while there are some very cheap ones on Ebay they are usually very poor quality. WHAT ABOUT A SPARK ARRESTER? Please note, the GSXR pipe doesn't have a spark arrestor. In some countries this can be a big issue. FMF have a screen type SA that pops right into the back of the GSXR muffler. See this link for more info and pics. WHAT ABOUT JETTING? The stock muffler is so restrictive that you will notice better performance immediately with the GSXR pipe. However, to maximize the benefit you should rejet and open up the airbox too. We cover cheap do-it-yourself mods in this BST magic thread, otherwise just buy an aftermarket jetting kit and open up the airbox. This has been collated from various sources, but particular thanks to the guy who did this webpage (check it out, heaps of info and pic there) and guys from the Thumper Talk and DR Riders forums as well, a lot of their info is in here.