i prefer the fass. i have installed many fass and air-dogs, and the fass is just simpler to install and they work awsome. i have a 95/200 @ 55psi it works great but it is loud. i have mine on a toggle switch so when i dont need the fuel i can just trun it off when i need to have all that fuel flip of a switch. also if you have a titan tank you have to re-locate the air-dog because it mounts on the inside of the chassis. fass its always the same mounting spot. one more thing, my buddys D-MAX was T-boned by some dumb lady on the driver side and the whole cab and bed were messed up and the fass was smashed but still works and no leaks, they are tuff suckers.