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Toyota Diesel Ultimate Valve Upgrade kit 2L 2LT 2LTE 3L Diesel Upgrade. When its time to freshen up the tired old diesel do not overlook the all important valve train. We have put together our exclusive set of +1 oversized valves with new OEM springs to freshen up the valve train and bring your rig back to life. With our custom designed valves you get increased air flow over the face of the valves leading to better throttle responseand overall performance. If you want to get more power our of your rig this is the kit for you.