DRZ400 3X3 Airbox Mod

The “3X3 airbox mod” is the opening up the airbox inlet to a size of 3 inches x 3 inches to increase airflow. Teamed up with upgraded jetting and a performance exhaust it provides a noticeable performance improvement.

On some DRZ400 models the 3X3 airbox mod requires material to be removed from the top of the airbox (with a sabre saw, dremal, hot knife etc) however on the modern DRZ400E Suzuki has made life easy as the airbox hole is already 3 inches x 3 inches with a removable snorkel that restricts airflow. It is simply a case of removing this airflow restricing snorkel to expose the larger 3 inches x 3 inches hole and the 3X3 airbox mod is done.

For more information on working on the DRZ400, I highly recommend the Clymer DRZ400 Service Manual. This is one of the best manuals I have used. It has helped me rebuild four DRZ400 engines over the years and perform numerous maintenance tasks. The instructions are very clear and it has very intuitive photo guidance. Click here for the Clymer DRZ400 Service Manual.