ebay is a nice place to look for cheap parts, but like everyone else said, make sure you get name brands and read the fine print. also make sure you look at shipping prices and etc. someone might only ask for $150 for an AEM intake but then make the shipping like $70. i got everything on my car on ebay for hella good prices. i bought a voltage stabilizer too from ebay, a Greddy trust unit and it made my stereo put out more bass and my headlights were slightly brighter but i didnt see any increase in torque.