04-06 Hyundai Elantra 4Cyl 2.0L w/ MAF Cold Air Intake Kit Red w/ K&N Air Filter Replace stock restrictive air box. Increase horsepower and torque; also improve the gas mileage. This cold air intake can help your engine to suck in more cooler air resulting in better throttle response and higher performance output 2.75" inlet K&N air filter (SKU# RU-4450) is pre-oiled from the K&N and is ready to be used. All Necessary Hardware are included. General installation instruction is included Vehicle Application: 2004 2005 2006 Hyundai Elantra 4Cyl 2.0L with Mass Air Flow Sensor