TST offers an injector kit for $510 which increases the power by 50 horsepower and 100 lb-ft of torque at the ground on '98-'00 automatics. These same injectors add 33 horsepower and 66 lb-ft at the ground on manuals and '01 automatics. Throttle response and low-end acceleration are definitely improved with this addition. Fuel economy normally improves by 5% with this change. Injectors can be installed within about 3 hours by most do it yourself enthusiasts. No special tools are required that can't be bought at most Sears or other auto stores. These are new Bosch® injectors approved by Cummins® on their 275 hp 660-torque motorhome engines. These injectors do not wash oil off cylinder walls and dribble at idle like some aftermarket injectors that are modified Bosch® injectors. Some 1998 24 Valve trucks need connector tubes with these injectors, these trucks have an engine serial number below 56462591. Connector tubes are $85.00.