joejamesatou

200k miles on the clock for the stock 6.0. Dyno pre-mods was 260 hp and 280 ft-lbs. Mod list:

1-7/8 inch Speed-Engineering headers
BTR Stage 3 truck cam w/LS6 valve springs
Underdrive pulley
E-Fans
AMP Performance Tune

After is 324 hp and 343 ft-lbs.

G Atsma

Nice gains! Better fuel mileage too?

joejamesatou

Ha! It's a 5800 pound Suburban. What is this mileage you speak of?

G Atsma

Hey, even if it goes from 10 to 12, it counts! lol

joejamesatou

Nah. It's more like 15 to 14.5. Costco is my friend for gas .

G Atsma

Well, that's just because you are hammering it to feel the new-found power you have. Once the new wears off I think you should get better mileage. Your setup should be more efficient than the old one.

jhshnh