I know this is a pretty old thread but I wanted to get on here and find out if anyone was using a cold air intake. I just wanted to reply to the notion that more air into the engine means more fuel used. That notion is pretty ridiculous. Any time you make an internal combustion engine "breathe" easier, you increase it's efficiency. A fuel injected car will operate at a set fuel mixture point. That is true. It is the downstroke of the piston in the engine that draws air into the motor. When you make it easier for the engine to do that, (with a higher flowing filter) you reduce the amount of energy wasted on drawing that air in. That is why a turbo or supercharger increase power while adding efficiency. They remove that drag on an engine. The same holds true for exhaust. The freer flowing the exhaust, the less waste of energy pushing the spent fumes out. I just wanted to find out if anyone replaced the air intake tube from the filter box to the throttle body.