99-03 7.3L Ford Powerstroke EGT (Exhaust Gas Temperature) Control Keeping your exhaust gas temperatures (egt's) in check is one of the biggest challenges that every diesel enthusiast with a 99-03 7.3L Ford Powerstroke faces. Snow Performance has the solution. Snow Performance water/methanol injection systems for Ford diesel trucks not only helps to cool egt's but also adds power at the same time.The latest from Snow is the Diesel Stage 3 MPG-MAX™ Boost Cooler. It is the only system proven to increase fuel economy in all load states – empty or while towing. Special mapping and the most sophisticated 2d digital controller available result in 1-3 MPG increases!