You can buy a wide band setup and monitor your a/f but here's the down fall for that. If for some reason the bike goes lean while your riding it to make the data file, kaboom! On the dyno you can watch the a/f while your tuning to monitor it in real time instead of adjust, ride, adjust, ride. You want to do it yourself and there is nothing wrong with that but to be happy with "close enough" is not what you want in your tune. Fuel systems can come from the factory with 0 miles and not flow properly. The main thing is to have your injectors flowed to see where their tolerences are. A good efficient nos system is only as good as the time put in to it. You can get your injectors tested for under a $100. I understand you want to do it yourself but there are just some things your not going to be able to do effectively. I suggest that you make your changes, take it to a dyno and see if your changes are working. I have a two guys that come from Alabama with a Hyousung (I guess thats right) and they have been making their own exhaust and playing with jetting for these bikes. They bring the bike over to me and all I do is make the pulls they need. They then see if the changes they have done made a difference, good or bad. Your going to need dyno time anyway it goes if your going to get things right.