Not 100% sure, but I'm willing to bet the '06 won't be any different than the '04 as far as the KLEEN is involved. It's just taking some covers, tubing, and a solenoid off. And in your cali. model's case, a charcoal canister. Then you just replace the oem covers with ones from Ivan and plug the airbox with a vacuum cap or silicon or whatever will seal the hole adn not fall out.
Take your tank off and you will see that instructions aren't really necessary. Hope I don't sound like a dick, 'cause I'm not trying to be one. It's just not a real complicated thing.