2.3l SOHC Lima engine, also called Pinto engine was first used in 1974 Ford Pinto
It was used in Ford vehicles until 1997 Ranger
It has a low power to weight ratio, weights alot and not alot of power, lol
But it was super reliable which was why it was used by Ford for so many years in so many vehicles
Mustangs had this engine for many years, 1975-1993
So Mustang forums are a good place to get ideas about changes that work and those that don't
You have a stock Cold Air Intake, and stock headers(mid-range) in any Fuel injected Ranger, 2.3l included
One mod that increases HP and MPG both, on ANY vehicle, is switching to an electric cooling fan and getting rid of the mechanical fan and fan clutch
Mechanical fan is always drawing power from engine so lowers HP and MPG all the time
E-fan only draws power(from alternator) when its on, and that should only be when you are driving slowly or stopped, when driving above says 30MPH the air flow thru radiator is more than any fan can provide so e-fan would shut off
Is it a big HP and MPG increase........no, but it ain't 0 either
You can get all the parts needed from wrecking yards