Hi folks, i have a quick question!! Ive read all over the forum about snorkel removal, co levels, dna stage 1 and 2 air filters and kevs mod. Ive just done a bit of tinkering around with my 06 xtx that ive had for a week and ive discovered a few wee bits and pieces. The first is that there is a k&n air filter installed already in the bike and there is 5 holes (approx 25mm diameter) in the side of the airbox already. (This has been done by previous owner and he has put little rubber plugs in to block up the holes). There is no stage 2 filter, just a plastic cover that screws off. Is it safe for me to pull out the snorkle with this existing set up? Can i also safely remove the rubber plugs? Also what would the recommended co level be for this set up with standard exhausts. The co level is currently at 5 although im not sure if the previous owner set it at this or if this is the factory level. I have adjusted it up and down just to see what happened and i discovered the bike seems to run a bit better at lower speeds with the co around 40. Again my question is: is this a safe level for the bike as i read in another post that you shouldnt go anymore than 10 above the factory level. Ive also read about a mixture that is too rich making the bike run lean. Exactly what do u guys mean by "lean" and how can i tell if my bikes running lean or not? Im real sorry if these are simple newbie questions so i apologise in advance, lol!! Im not just a newbie to this forum but to motorcycling in general though im really enjoying reading and learning all the info this forum has to offer. Thanks in advance for all advice :-) Dave