1999 Ford F-550. 7.3 2wd 6 speed manual. I have done a lot of work to the truck to improve the engine efficiency. This is a early 99 7.3. I have replaced the entire exhaust system. The manifolds were replaced. The up pipes have been replaced with late 99 bellowed ones. The entire exhaust has been replaced from the turbo back with a 4" turbo back system. The turbo was rebuilt and a wicked wheel was installed along with a high flow outlet. The turbo pedestal has been replaced with one with a non-EBV one. The intake plenums were replaced with late 99 ones. The intake was changed to a performance S&B intake system. I have never chipped the truck but with the foundation I have laid with mods I have performed it would be a perfect candidate for one. The clutch was changed approximately 20k ago. It does need the batteries replaced the ones in it do not hold a charge for more than a day maybe two.