I'm planning to do this to my Jeep at some point as well. I don't know about the Rangers, but I know for my Jeep the Ford Motorsports 24lb injectors (4 hole, rebranded Bosch +4) work fine. The 19lb ones may be good for a Ranger.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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