I've had cracked manifolds for at least 10k miles. No codes thrown though.

Do cracked manifolds cause much of a power loss? My truck just doesn't feel that fast, and after my embarassing run with a Ford Ranger, I quit racing people. lol

I'm just trying to figure out if my truck is really slow, or it's just me. If I had a track near the house, I'd find out for sure.

Hmmm, maybe a G-Tech would help? I know a few back roads I could run the 1/4.