I have tryed many different set-ups with my YZF 750. I found that after having a full Hindle exhaust it was a little too loud for anyone´s taste, but the bike ran great when I have it on there. I switched back to the stock exup header with a V&H slip-on. I also have a K&N filter, Factory config.10 jet kit, Factory pro shift kit, EBC friction plates,and a 15-tooth front sprocket (stock is 16). I just recently had the valves reset and the carburaters retuned. I´m very happy with the bike´s performance.