The tuning alone will add up to 40lb-ft of torque and 25 horsepower to your RV's rear-wheel output on 87 octane fuel, all while adjusting your RV's shifting to hold gears longer and shift firmer and faster. Peak torque also comes in lower in the engine's rev range, so that you get some extra low-end grunt for towing. The intake will improve airflow by a decent margin and provide some extra performance and throttle response on top of the tune.