I just picked one up from autozone. I will be using it to diagnose firing problems... just point the lazer onto an exhaust primary and see if its as hot as all the rest... if not... no fire in the combustion chamber.

Cool I aways wanted on of those. If you are running headers you can use it to help tune your carb. When a cylinder runs lean it gets hotter.

it was money well spent... only about 30 bucks.

I have one from sears we have used it for the header temps and use it to check the temp of the slicks. Also makes a good conversation piece when sitting around the fire having a few beers.