I also try to keep my nitro's warm and fuel them up before i head out so that they fire up easily. I keep them in the house, and many times I just walk out the door and run, so its not hard to keep em warm. However, I usually dont have a problem starting them cold. The biggest problem for me is like was said, the snow gets on the air filter, and cools the engine so fast, its impossible to keep a good tune. The cold is fine, its the snow getting all over the engine/filter that makes it hard to run. Just part of it[8D]

For a fuel/pressure line cooler, you could buy some small copper tubing, coil it up 5 or 6 times in a roll, and plug the original tubing back into each end. The copper allows the heat to suck out and it would be cheap and very effective, just wouldnt look as nice as the one you have

Eric