Bring your 4.6L Modular V8 to life with a custom performance tune from P1 Underground.

Whether you're driving a classic New Edge Mustang or an S197 GT, the P1 Underground SCT Performance Tune is designed to enhance your Mustang's power delivery, throttle response, and overall driving experience.

Our custom calibrations are tailored to your Mustang's specific engine configuration, modifications, fuel type, and performance goals.

From stock daily drivers to heavily modified 4.6L V8 builds, P1 Underground delivers personalized tuning solutions designed to make the most of your Mustang.

Features & Benefits

• Custom Performance Calibration: Personalized tuning developed around your vehicle's engine configuration and modifications.

• Optimized Throttle Response: Improved throttle characteristics for a more responsive driving experience.

• Air/Fuel & Ignition Optimization: Refined fueling and ignition timing appropriate for your engine configuration.

• Enhanced Power Delivery: Calibration adjustments designed to optimize engine performance throughout the RPM range.

• Improved Drivability: Refined idle characteristics, part-throttle operation, and overall engine responsiveness.

• Modification Support: Custom tuning for compatible cold air intakes, intake manifolds, injectors, and other performance upgrades.

Supported Applications

1998–2010 Ford Mustang GT — 4.6L Modular V8

• 1998 Mustang GT: 4.6L 2-Valve V8 (Non-PI)

• 1999–2004 Mustang GT: 4.6L 2-Valve V8 (PI)

• 2005–2010 Mustang GT: 4.6L 3-Valve V8

Compatible configurations may include:

• Stock / Factory Engine Configurations

• Naturally Aspirated (NA) Builds

• Cold Air Intake Upgrades

• Full Bolt-On (FBO) Configurations

• Aftermarket Intake Manifolds

• Compatible Fuel Injector Upgrades

• Supporting Drivetrain Modifications

Forced-induction applications require additional review and may need a separate custom tuning package.

How Remote Tuning Works

1. Submit Your Vehicle Information: Provide your Mustang's year, engine configuration, modifications, fuel octane, and performance goals.

2. Receive Your Custom Tune File: Our tuning team develops an initial calibration specifically for your Mustang.

3. Flash Your Vehicle: Load your custom tune

4. Datalog & Refine: Submit requested vehicle datalogs for review and any necessary refinements included in your tuning package.

5. Enjoy the Difference: Experience a more responsive Mustang with a calibration tailored to your setup.

Requirements & Important Information

• A compatible tuning device is required and is not included with this purchase.

• Available calibration features vary by model year, engine, transmission, and ECU.

• Customers must use the fuel octane specified for their calibration.

• All engine and supporting modifications must be disclosed before tuning.

• Power gains vary depending on vehicle condition, modifications, fuel quality, and environmental conditions.

• This product is a custom electronic tune file, not a physical tuning device.

• All calibrations must comply with applicable emissions and road-use regulations.

Classic Mustang. Modern Performance.

From the legendary New Edge to the iconic S197, P1 Underground brings custom performance tuning to the 4.6L Mustang GT platform.

Your Mustang deserves a calibration built around your setup, not a generic one-size-fits-all tune.