what is a good upgrade for hp and mpg i know that the cool air intake is ok and a tornado is supposed to add mpg but most of the time these do not work and i know their is a methane injection upgrade and that does like 70 to 100 hp and 1-3 mpg but i want something cheaper that still works ok. I also know you can have bigger pitons or put a chip in the computer but those only increase hp not both hp and mpg

 

you can add a throttle body spacer and upgrade your exhaust

 

what is a throttle body spacer and i didnt know that exhaust upgrades helps hp and mpg

 

The throttle body spacer goes in the fuel/air intake area of your engine, and can be installed in under an hour using common tools. For older vehicles with carburetors, this component simply increased the volume of the fuel/air mixture, or allowed for a more dispersed fuel spray, which could be burned more rapidly. Today, most vehicles use a fuel injection system. Modern throttle body spacers are designed to enlarge the air entry passageways and allow for a greater and more forceful amount of air. This means your engine does not have to work as hard to get air in, and lets that "found" power get used where you want it most: down to your wheels. The installation of a throttle body spacer can add up to 25 ft lbs of torque and up to 18 HP. In addition, the throttle body spacer improves your fuel economy and nets gains of up to 4 miles per gallon. Adding a throttle body spacer to your engine is a fast, inexpensive performance modification that will save you money on gas as it gives you more power.