BHP+20 hp (5%)
Standard
421 hp
Tuned
441 hp
Torque+20 Nm (4%)
Standard
542 Nm
Tuned
562 Nm
Suitability
Limited (3/10)Gains Profile
Limited headroomHeadroom
LowFord Mustang GT 5.0 V8 421hp ECU Remapping
Considering an ECU remap for your Ford Mustang GT 5.0 V8 421hp? A Stage 1 remap can take this 2015 - 2018 petrol engine from 421 BHP to 441 BHP and from 542 Nm to 562 Nm of torque (naturally aspirated). This engine scores 3/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your Ford Mustang can achieve.
How this engine compares
- 7thof 15 Ford Mustang engines by power gain
- 14%of the 9,842 engines we hold gain data for see a smaller power increase
- 8%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
The Ford Mustang GT 5.0 V8 421hp is a 5.0L naturally aspirated petrol engine producing 421 BHP and 542 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 441 BHP and 562 Nm — a gain of around 20 BHP (5%) and 20 Nm (4%).
This engine has low remap suitability, though the available headroom is limited, so gains are modest compared to higher-output variants. The tuning headroom is classified as limited, based on the percentage gain available from the factory output.
Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.. High tuned torque: check transmission torque capacity and service history.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.
Considerations
!Naturally aspirated engine: gains are usually limited; results vary widely.
!High tuned torque: check transmission torque capacity and service history.
Other Mustang 2015 - 2018 Engines
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