advanced Flow engineering (aFe Power) introduces its latest Stage 2 sealed air-intake system for the Ford 6.7-liter turbodiesel. A plastic intake box houses the filter and blocks out engine heat with two auxiliary air scoops for additional airflow, plus an intake tube that aFe claims will maximize horsepower, torque, fuel economy, and throttle response. There are three filters from which to choose: the Pro-5R, Pro Dry S, and Pro Guard 7 performance air filter. Testing with the Pro-5R filter produced an extra 21 horsepower and 55 pound-feet of torque. Price ranges from $415 to $479.