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Stock 1997 -1998 Ford Ranger 4.0L Dyno test results (at rear wheel):
129 HP @ 4250 RPM and 182 Ft-Lbs TQ @ 3000 RPM
With Prem Fuel tune Dyno test results (at rear wheel):
135 HP @ 4250 RPM and 192 Ft-Lbs TQ @ 2500 RPM
Max HP : +9 HP @ 4750 RPM
Max TQ : +23 TQ @ 1500 RPM