I imagine there are a number of bolt-on parts that will add power. Look for cold-aid kits, cat-back exhaust systems and carb/throttle body spacers. Both Spectre and K&N make high-flow air filters for your van. If you don't find a cat-back exhaust, even a replacement muffler from Magnaflow or Flowmaster would add a few hp and improve the sound. If you really want to get into the engine, try a new set of heads or port the stock heads. The guys at Pacific Performance Products can help you with that. Call and ask for Troy.
Spectre high-flow hpR filter for 1991 Dodge Ram Van 1500. Part #880160
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Spectre high-flow hpR filter for 1991 Dodge Ram Van 1500. Part #880160