I never could see the overall advantage of changing the stock pipe. The FZ1 will blow almost any four wheel vehicle off the road in speed and maneurverability and although some more power can be extracted from the engine it isn't necessary as you already have 125 bhp on tap as it comes from Japan. When the exhaust is changed in many cases the engine doesn't run as well and the sound is either obnoxious or a drone, or both. If you want to save some weight replace the exhaust shields with something like these feather lite carbon fiber shields, and remove the passenger pegs (if you don't ever take a passenger). Just doing these two things will save 3-4 lbs and make it all look better. I like the sound and look of the stock pipe with these mods; loud enough when you whack it open, yet quiet enough when you are cruising along. The stock pipe is maligned way too much.