I'm a person who loves a lot of small, easy gadgets to work on. That eventually will make a big difference in my RAV4. I purchase at Summit Racing a roll of DEI http://www.designengineering.com/ . I'll use it to wrap the exhaust pipe of my header to keep a barrier between heat and the rest of the engine compartment. It will also keep wires and hoses from melting under extreme conditions. Heat is the enemy of your engine.