Sorry bud we tryed the big engine. Truck was slower. Dezert racing! The lighter 4.0 works tons better. Problem is This truck was bought alreaddy built. and has no obd2 port for me to plug into like my other ones. So hard for me to disect whats wrong. Personnaly I perfer new elctronics and sensors. But unfortunatly its kicking my *** for the first time. lol.