The OS (non piped) with a "little" loving, will smoke a TT (non piped) with a whole lot of lovin. Just the truth of it. I have seen some very fast piped TT's run, but in the sport class (stock muffler, etc), you wont beat a properly set-up OS.
Just look at the race results, and what all of the fast guys are running. That will tell you all you need to know. I have been to every World Tunnel Champs race since the inception, 6 years now. I can count on one or two fingers how many Thunder Tigers have actually been run, much less actually placed. Just being honest here, you asked if you would have a chance with a TT, the answer would be NO in our neck of the woods (dont know where you are located) in the stock/sport class.
With that being said (
), as the IMPBA National Outboard Director, I would never discourage anyone from buying a particular brand if it meant they wouldnt start racing tunnels. By all means, buy the TT and run the snot out of it if you arent sure about spending that much money yet. You can have a WHOLE lot of fun with any engine.... just get out there, and the rest will come!
~ James