For all those who have not piped their z's yet you dont know what your missin'. Finally got my Trinity stage IV and K&N put on and now its like a completely different bike. So much more power its not even funny. I dont know why suzuki lets these things out of the factory so choked up. It was well worth wait to get this pipe (month and a half). The sound is awesome(louder than i was expecting, but still sounds good), and the power curve is so much better than stock. Now it pulls all the way through top gear without the nosedive in hp at the top end. Much more torque on the bottom end as well, will pull front off the ground with virtually no effort through first 4 gears. Now i just gotta drop some cash on some decent tires to get the power to ground(dunlops like to spin a little to much) Maybe santa will bring me some razors :twisted: