I have a couple questions that i hope some one can help me out with. I have. 2006 zx10 and when i bought it last year never really planned on doing anythin to it beside change the exhaust to clean up the rear a lil bit. Well i installed a comp werkes go exhaust on it land love the way it looks and also put a pc3. Now a bunch of people around town are starting to buy liter bikes and well i just wanna help wake mine up a little more. Ive been using the search alot and still need a little clarification and peace of mind on a couple things... I want to gut the cats but will only do it if it wont harm the bike like the exhaust valves and if there is performance to be gained by doing so. Does anyone have any experiences with this? Also im thinking about changing the air filter to a bmc street filter because i live in texas and theres alot of fine dirt around here. The last thing is removing the secondary butterflies. Would all these mods help me out or is there one thats not even worth it? Ive search for the top 10 mods and found a link but doesnt bring anything else up. I wont really be messing too much with the motor until next year so any help or advice is appreciated.