Folks, the UCON kit is supplied as a bundle of performance components all designed to work together and is intended to be installed together.
It is like installing one of our supercharger kits and decide not to install a critical component like the upgraded fuel pump. It is just not going to work as designed and bad things can happen.
You can install the gears and thermostat and then do the UCON later, but not the other way around.
A friend of mine bought an X-1 kit from me a while back. He only installed the X-1 and not the entire kit in his supercharged Tacoma. He went for his full throttle test drive and ended up getting towed to the dealer to have a new engine installed. Luckily I got him hooked up with a guy I know and he got his stuff covered under warranty, but he was stupid and blew his stuff right up.
Anything worth doing is worth doing right. If you are not going to do it right, go buy a unichip.
G