Last year I was in Reno for Hot August Nights and bought a PowerBlast Plate from Thompson Performance. The salesman made a good pitch for the product and had a cool video presentation, so I figured I would give it a try.
Well I finally got around to installing it after looking at the online instructions which are very well done. I don't know why I waited so long, but man I can't believe how much it changed the off the line acceleration of my truck. I made it fill like its got a lot more horsepower and torque from a standing start. The throttle response is instantaneous!
I don't endorse a lot of products, but this one really worked great for me. Now 4 of my buddies that have heard it perform asked me to order one for them.
http://www.thompsonperformance.com/