is their any performance parts for a 6.2 gm disel engine?

[MUSCLES]

the engine is in a 1991 p 30 panel van, on the air cleaner it says it is 165hp. The engine is pretty good on speed to be in a 8,000 pound truck it will hold a steady 75 to 80mph, but the torq is crazy we pulled a house of its founddation with it and we put 10.00 pounds of bag dirt and it hauled it no problem the engine is pretty strong the way it is, but i was wondering if i could make it any stronger. With a turbo