My 99 2wd 2500 ext cab has the 275 injectors and the TST powermax 9 with a bhaf. I liked the get up and go but egts above level 3 were over 1300. I got a new HX40 from Piers and installed it with a 4" exhaust and hot dam even more get up and go. Also I have seen peak egt's 150-200 degrees lower. Now level 6 runs at 1340 (peak). I had been told that these "enhancements" would not lower egt's. Oh the new sound is AWESOME. Oo.