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GrimmSpeed Exhaust Valve Defeat Module — 2015+ Mustang GT350/GT350R
GrimmSpeed part 070044 is an exhaust valve defeat module for the 2015 and newer Ford Mustang GT350 and GT350R. It plugs in to override the factory active exhaust valve control, keeping the valves in a fixed state for a consistent exhaust tone.
Key Features
- Plug-and-play exhaust valve defeat module
- Overrides factory active exhaust valve control
- No permanent modification to factory wiring
Fitment
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2020 | Ford | Mustang | GT350 |
| 2015-2020 | Ford | Mustang | GT350R |
Specifications
| Detail | Value |
|---|---|
| Manufacturer part number | 070044 |
| Installation | Plug-and-play, no wiring cuts |
What's Included
- 1 exhaust valve defeat module
About GrimmSpeed
GrimmSpeed designs and manufactures performance parts for Subaru, Ford, and other platforms, including intake, exhaust, drivetrain, and suspension components engineered and tested for real-world performance gains.
FAQ
What vehicles does this module fit?This module fits the 2015 and newer Ford Mustang GT350 and GT350R.
What does this module do?It overrides the factory active exhaust valve control, holding the valves in a fixed open state for a consistent exhaust tone.
Does installing this module require cutting factory wiring?No, this module is designed as a plug-and-play installation without permanent wiring modification.
Is professional installation recommended?Installation is generally straightforward, but confirm your comfort level with locating and connecting to the factory exhaust valve wiring harness.
Can this module be removed to restore factory function?Yes, since it is a plug-and-play module, it can typically be unplugged to restore factory valve operation.
Does this module affect check engine lights?This module is designed to defeat the valve control without triggering related fault codes; confirm compatibility with your specific model year.
Will this module make the exhaust louder?Holding the valves open typically results in a louder, more consistent exhaust tone compared to the factory active valve behavior.
Does this module work with aftermarket exhaust systems?This module defeats the valve control regardless of exhaust system; confirm compatibility with your specific aftermarket exhaust if applicable.
Installation Instructions
- Locate the factory exhaust valve control connector per the vehicle's wiring layout.
- Disconnect the factory connector and connect the GrimmSpeed defeat module in its place.
- Secure the module and any wiring away from heat sources and moving components.
- Start the vehicle and verify the exhaust valve behavior matches the expected defeated state.
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