There is a very big thread on smoke switches. Two of them really. One is more towards second gens and the other is 3rd gen smoke switches. Let me try to find the thread for you.
Basically what it is is a switch that you can turn the signal on/off to the map sensor. With the signal off it will read full boost all the time and the computer fuels accordingly. No boost, but fueling like there is full boost = lots of smoke. Make sense?
And this one is more in general. It works best if you have a fueling box but it will work on a stock truck. If you're stock you will lose power with the switch on unless you have some type of boost fooler.
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