Has anyone bought and tried out one of these? This is what I found out about it. ----- With the addition of the electric starter to the WR, intake airflow has been reduced due to the battery under the seat. Getting more airflow into the carburetion system will increase performance. The safest place to get more intake air on the WR is the side panel next to the air filter. Before you grab a hole saw and start drilling you need to take a few things into consideration. Without any type of shield you are asking for trouble as debris will be sucked inside clogging the air filter. You also stand a chance of ruining the side cover. Barnum Pro Products air box mod is made of billet aluminum with fine mesh screens that allow more airflow yet keep small particles out of the air box. You do need to clean the air filter more often but the power increase is well worth it. Performance wise the $68.95 kit is inexpensive horsepower. I'd guesstimate a 2 HP gain with it.