Yes I have a 1200. I have quite a few friends who have driven 600s, and modified them. All of them eventually went to the holeshot jet kit. I don't know if the baffels in the mid pipe for the 600 makes THAT much of a difference. Like I said I had JUST learned this yesterday. I was talking to Dale about Horsepower, and he mentioned that the baffel in the midpipe is worth about 5 hp in the 1200. It would definitely open up the airways either way. The things I have learned about 2 Gen 600s--Jetting and opening up the airways does work, and you benifeit from it greatly. Opening your exhaust and intake works very well, and the 5 degree advancer does nothing for Gen2 bikes or 600s of any gen. Granted you won't see the HP of a 1200 you can still make it nice. I only know one person that has a Gen2 600 and he went all out on the mods for his bike. It turned out nice, and when my 1200 was stock he could keep up a little. But now, he doesn't stand a chance, and that is just with K&N, Yosh R3, Jetting, and timing advancer. Just with that and removing the snorkel I have 117 Max power. Next I am dropping the piston kit, and GSXR cams, and having the heads milled. I think there are mods like that for the 600 to push its potential. These guys on here would know better than I would, but it is worth a try and some bucks to get it to do what you want. I was just letting you know that the "Do It Yourself Jet Kit" is just as expensive as just ordering one. Oh yea, I have heard that the "Dyno Jet kit" Is crappy on Gen2's. Holeshot and Ivan's so far are the best ones for Gen2, plus either one will sit on the phone with you and help if you need it, Dale will walk you through if you need it.