trick flow kits have no problem putting 300 minimum to the tire on a stock bottom end 5.0 with a 5-speed.
if they don't it's because your tuner has no clue what he is doing. usually when they don't they feed you the line
"it's tuned safe" which is BS. and if your tuning it yourself
with a tweecer, or whatever, and you don't make 300, you don't know what you are doing.
through an auto is a different story.
hell my car made 300hp on a break in tune with street heat heads, and stage 1 cam and a gt-40 upper and a ported
lower. with shorty headers a catted h and flows. with no timing in it at all..........yet.
so if he paid for a tune and the car only made 260 with a tfs kit, he got ripped of on the tune, not the kit.