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A Power Commander modifies the output from your ECU. It is a device that attaches to the bike and plugs into the wiring. TuneBoy reprograms the map in the ECU without anything added to the bike. You can reload old maps, stock maps, or other people's maps into your bike to see what you like best. You can use Power Commander maps with it. You can also perform diagnostic tests like the Triumph gameboy tool that the dealers have, so you can read trouble codes, for example. The only drawback to TuneBoy that I know of is that you need to be able to place a computer close enough to the bike to reach the ECU with a 6' or so cable. If you have a laptop or can put your desktop in the garage (or the bike inside next to the computer), then TuneBoy is the way to go in my opinion. I have been using it for a couple of years now, and I am very happy with it. I have really fouled up my bike, then figured it all back out. It is a whole lot of fun if you like to twiddle with machinery. If you want to set it and forget it, either one is fine. I think the Power Commander may come with some kind of map already loaded. TuneBoy only does what you tell it to do and there is no map included with the software. You can get maps from t595.net, but most of them are out of date. The best TuneBoy map for TT600s is for the specific cam and exhaust arrangement that is unique to 2000 models.
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