Wel, I did some searching here yesterday and read quite a few posts about the TRE mods. Found a diagram of how to wire one up myself over at onedownfiveup.com so I decided I'd give it a shot. Went to the local Radio Shack and $15 later had all the stuff I needed (male/female quick disconnects, 30 foot of 3 different color wires, a DPDT switch with on/off labeled plates, and a couple 15k ohm resistors just incase I broke one during installation). Came back home, looked at the diagram and hooked everything together so that if the switch is off it's in stock mode, and if the switch is on, the TRE is activated. Installed it on the bike, ran the switch to the tail area (best place I could think of to mount it without any crazy custom work) and tested it out. Started it in stock mode, let it idle for a little to get the oil circulated, and then blipped the throttle a couple times. Just twisted it a 1/4 turn realfast and then closed it again. There was the usual hesitation and everything was normal. Switched it to on (TRE mode) and when you blip the throttle, that hesitation is GONE. Took it for a test ride in TRE mode and I could tell a HUGE difference. (This will be my second season riding it, so I'm used to it being stock, and with the TRE I can tell a noticeable difference.) I even let a friend ride it (he has a moderately modded 636 so it wasn't TOO exciting for him)...But he rode it in stock factory mode first and then switched it to TRE and even he could tell the difference. I would suggest doing this mod to anyone who wants a little more pick up in their 600. I would also recommend doing this yourself, as it took me a whopping 30 - 35 minutes to make the unit, and another 30 minutes or so to install it, and it saved me $30 by not buying a switched unit off the net. If you don't mind cutting wires on the bike (I've gotten used to it after switching the front sprocket and installing the Yellow Box, plus putting in my Gregg's Custom flushmounts, and the rear fender eliminator) I would DEFINITELY do it yourself. Very wisely spent $15 and a good 1 hour of my time spent.