01-03 Elantra CAI Install
1. Remove all stock intake components from the throttle body on. To remove the resonator that is below the hole in the fender well, you may have to remove your bumper. Also remove your battery so that you have more room to maneuver.
2. Connect one of the red connectors to the top intake tube, by putting two clamps on it, and tightening the clamp that attaches it to the intake. For now, leave the other clamp that tightens it to the throttle body loose. Connect the stock rubber hose to the bung on the top intake tube.

3. Connect the bottom intake tube to the top intake tube by first slipping it into the hole in the fender well. if you need to enlarge the hole for fitment, use a dremmel to widen the hole. You then can attach the intake tube to the top intake tube by the other rubber connector, using two clamps. After these items are in place, make sure all clamps (4 total) are tight.

4. Go under the car, and then install the filter to the end of the bottom intake tube. Make sure the clamp is tight.

5. Put back the battery, and anything else you may have disconnected during install.