I had 28 Zilla's with the pipe and KN and had it properly jetted with the Rubicon Iridium spark plug.If you had momentum it would go trough anything,but if you came to a stuck position it could barely turn the tires.I then put a HL clutch kit and that helped it out alot in crawling mud conditions,were before it would be bogging.I def rec the Mudzilla's over Outlaws anyday of the week,they clean out better,ride smoother,and they don't dig you down to your floorboards when you floor the gas.This is just my personal opinion,I found the Outlaws would just dig my 450 straight down in thick mud,the Mudzilla's had a better ability to crawl across mud in low gear without spinning out.Good luck in your choice.