Well I am new to diesels and i just bought a 1997 F-250. It has gauges and a 5 inch pipe that comes out before the rear wheel. Its a 5 speed and It has 190,000 miles. It pours out black smoke when i get on it and picks up pretty good. How can i really tell what modifications this truck has? Will a pipe alone gain alot of power? I want to purchase a programmer but I am not sure what to go with? Any information would be helpful.