i live in Québec in canada i'm pretty our winter are a alot more hard then the one north of arizona over here -30°c is somewhat "Normal" in january :P i ran my accent for 5 years with no coolant line in the TB and never had 1 bit of problem in the winter i always removed the part of my CAI that was going Down to the ground ..... so it was like having a Short ram pretty much....
for the Camshaft from the other hyundai car you don't have to get Both at the same time putt wile the cover is up why not do both ? :P less money you speed after on istalation if you don't do it your self

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for the Cam Gears well it either Advance or Retard to opening of the Valve don't buy that right now because to get the maximum gain out of it you have to Tune it on a dyno... like advancing 1° testing the car advancing a bit more testing again .... till your on the spot

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you could buy a Underdrive Crank pulley it doesn't give hp but it's free up some of them you see an engine loose power at some place when you modify thing like the crank pulley of the flywheel you gain a few hp that the engine needed to turn the Heavyer parts

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