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has anyone tried the Tbikes on a 05 speedy, and if so how did they fare as far as performance increase?

Got em on my '05 SM and they do seem to have added something material to the riding experience. Hard to be objective though cause the baffle design has resulted in such a pleasant range of sound from a steady rumble to a rolled-on bark. Makes you think the power delivery has improved as TB's dyno says. IMHO, if you are heavy into power/torque improvements, you'd likely be better off with alternatives that require modded intake & fuel delivery tunes. I'm completely satisfied with the combination of TB's and the stock 16-tooth sprocket.