It appears that the next step for power in my pickup is going to be one of the three. After speaking with a vendor I began to think that big oil should be next. However, searching the threads made me think that injectors would be a good way to go. All I'm looking for is more towing power as I'm trying to avoid buying a new truck. I do realize I'm handicapped with PMR's so I can't go extreme. Any tips would be appreciated.