Really, you can save the $23+shipping on the kit and buy just the throttle linkage for the 2.5 rustler. I cant imagine this would be more than $5. Use the rest of the money to buy a decent pipe for the engine. The black plastic pipe that comes in the 2.5/3.3 conversion kit is a piece of junk. I bought a TRX blue alum. pipe for $25 new, a header, and the carb. linkage and I was set. The kit sounds like the better deal, but IMO its not. You could probably find most of the parts seperately on the 'bay for a heck of a lot cheaper.