You can do it yourself but I would recommend you consider either a Factory Pro (my choice) or Ivan's jet kit. They cost more but they seem to have put more work into them. I guess I am just prejudiced against DynoJet and K&N.
don't buy a K&N(dynojet)... I made that mistake and boy....what a disaster - In dynojet's defense the zx6r varies widely from bike to bike, but the final settings that I ended up with were FAR from what dynojet recomended started out at. Also, during one of the MANY phone calls with Dynojet discussing their less than fantanstic kit they told me that the kit was designed for use with a stock filter, so if you have a K&N filter, you'll have to do a lot of extra work, because their recomendations are quite a bit off where you'll need to end up. Hope that made sense... I have since installed a factory race jet kit which is fantastic, though that kit required drilling and tapping the carb body
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