Honestly... My best advice... Read the article Blue has in his sig... Learn from this site.... SAVE YOUR MONEY, its NOVEMBER after all, really too cold to start modding projects unless you'll be working in a heated garage, buy the parts and put them up until spring, and learn how to do it before you start, or just save money and let it build to buy several parts this spring.

1) cold air intake, in COLD weather with no tuning will be bad on MPG and not worthy of noting hp increase

2) colder thermo on COLD weather will really be bad on MPGs as its too cold to get to optimal temps

3) too cold to put in a new tranny, or headers, or any HARD mods

just wait til spring