Personally I would not recommend a tuner for the first gen 4.7 with manual trans. The auto trans improvement is the only reason I kept mine. Like I said above, I believe the claimed power is there but it comes at such a high RPM that it isn't noticeable in everyday driving. If you are drag racing your truck I might consider it but otherwise I wouldn't. The only other benefit is possibly slightly improved fuel economy. I am running the 91 octane performance tune and have seen about 1 mpg increase but I'm also having to run 93 octane fuel because 91 isn't readily available here so.....that's my two cents.
06-08 chrome clads w/33" Cooper Discoverer H/T Plus, Mopar tailgate spoiler, debadged door trim & tailgate emblems, 13" antenna, LED dome & maps, Magnaflow 22" SI/DO, 18% tint, "HEMI" hood spears, VHT tinted tails & third brake light, Lamin-x optic blue fogs, leveled w/McGaughys 2" drop shackles.