Depending on how much your willing to spend, and how much horsepower your wanting to make. If you want a ton of power, and have a good size checkbook, check into buying some of these items I've listed... Turbocharger/supercharger (single or duel setup), camshaft upgrade, bigger exhaust (duel exhaust if possible), highperformance spark plug, and bigger carburetors. And if you may want to check into buying bigger fuel injectors if you buy one or more of these items that I've listed.