2002 Chevy Silverado 1500 5.3L
Lets see....I installed a flowmaster 40 series muffler and an AFE cold air intake and saw some significant improvements. Only problem was after I installed the AFE kit my idle rev was almost at a stall. I installed the flashpaq tuner and this issue was alleviated. The tuner also made the shifts much smoother. Obviously my truck is still a "truck" but its fast and pulls hard all the way to 100. I smoked a Dodge 5.9L R/T!! JBA headers are going on next week. Its not a cheap item, but the fact that you can grow with the tuners downloadable features is a huge plus. I would buy it again.
Easy to install, on the fly tuning. Noticed better miles per gallon (about 3 miles plus highway, 2 in town) on performance tune running 93 octane. Better throttle response. Only other mod installed on this 08' A/C is a takeda short ram. Wanted to do exhaust header and underdrive pulley before programer, but got such a good deal, had to go with this first. Will work great with future mods. Satisfied.