I think he's referring to the $30-$100 "chips" that wire into your rigs electrical system. These often advertise crazy MPG, HP & Torque gains. It's a plastic box with a few capacitors and maybe even an actual circuit board in them with two wires. I wouldn't even waste my time. I could build one for $5.00 in my garage. I'll make you a deal and sell it to you for $15.00 instead of the eBay price.