I bought these from a guy that said he got them from piers. Apparently it is the same set Piers ran in his truck. They are supposed to be 100 hp. but they make tons of power and I went from 9. 3 mpg stock to 13. 5 mpg with the ez and last night we made a 350 mile trip and i got 14. 5. Thats really hard to believe it got that good. I'm still in shock. But anyway, the injectors are awesome. It will hit 1600 degrees with no problem though. But my SP 66 will be here Monday and hopefully my new upgraded TST with twins and timing will be here too. Can't wait to get it on the dyno with these upgrades. I know on my 2001, I spent a LOT of money to get it to run like this truck runs right now. I do have an injector question though. #5 and #6 injectors had buildup on the tips, #6 was really bad. Anyone else had that problem? It always sounded like it had a slight miss, but all 5 of them that we have in our family sound the same. But now it idles a little smoother. The tick tick tick sound isn't as loud. The truck only has 12000 miles on it.