The Liqui Moly Diesel Combo Pack includes the Pro-Line Diesel Intake Cleaner and Speed Tech Diesel Additive. The Intake Cleaner is a high-tech solution that effectively removes stubborn dirt and residue from the intake and throttle valve, improving performance and reducing fuel consumption. The Speed Tech Diesel Additive enhances acceleration under partial load for a better driving experience. It is safe for all diesel vehicles, including those with catalytic converters and turbochargers.