Here is the information from ZZP's site:
Quote:
Air temp modules
An air temp module is simply a fancy packaged resistor made for people who don't know any better. Companies like SLP offer this for ~$25 and many are lured into purchase by it's low price and ease of install. It tricks your PCM into thinking it's cold outside and therefore "optimizes timing". In reality it does little to nothing and cannot change commanded timing by more than 1 degree (and that's on a hot day where you probably can't use the extra 1 degree of timing anyway). Save your money and don't buy it. If your curiosity gets the best of you, buy an 8k resistor from Radio shack and save $24.50
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