Ok so after getting my new special edition Z1000 ... and getting the first service done Ive been thinking about exhaust options. Ive seen a couple of options with a full system. Arrow do nice headers that ive been considering, although I want a black pipe because of the whole orange black colour scheme a shiny silver pipe is not my thing. Talking to the spare parts guy he reckons that going with bigger headers it will lose the bottom end. He reckons that I should stick with slip ons. Has anyone else with a 4cyclinder thou found that bigger headers lose the bottom end? I reckon getting rid of that massive cat would only help! I had a Suzuki sierra 1300 and put extractors and a straight through pipe on it. It had very little back pressure and wanted to stall, once you got her goin she flew, it didn’t sacrifice any torque (not that there was much to start with), it massively increased the torque. And why do 4wders spend a small fortune on a larger exhaust if it sacrifices torque? Isn’t that what 4wding is about? OK and sorry for the long post but can someone also explain how shape and size changes the volume and tone of the engine? Does a longer pipe make a deeper note or larger diameter at idle?