Ford Mustang RTR Spec 3-S Signature Package: 870 HP Supercharged Power Meets Tailored Studio Design
RTR Vehicles has expanded its vehicle personalization offerings with the debut of the Mustang RTR Signature Package. Designed as a bespoke extension for owners of the Ford Mustang RTR Spec 2 and Spec 3 platforms, this program shifts focus from traditional off-the-shelf catalog upgrades toward a one-on-one studio customization process.
Demonstrated on a Ford Mustang RTR Spec 3-S donor vehicle, the Signature Package combines high-output forced induction, fully adjustable chassis components, and a custom graphic and color palette tailored directly to the client’s creative vision.
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| RTR SIGNATURE PACKAGE ARCHITECTURE |
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| [ Whipple Stage 2 Upgrade ] ----> 870 HP / Supercharged V8 |
| [ Tactical Performance Chassis] -> 30-Way Adjustable Coilovers |
| [ RTR Studio Design Session ] --> One-on-One Client Collaboration|
| [ Custom Aero & Wheel Finish ] -> Tailored Paints & Powder Coats |
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The Core Platform: Ford Mustang RTR Spec 3 Engineering
The baseline for the Spec 3 builds upon the 7th-generation (S650) Ford Mustang GT Fastback. In standard Spec 3 trim, the 5.0-liter Coyote V8 receives a 3.0-liter Ford Performance Whipple supercharger generating 810 horsepower.
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| SPEC 3 VS. SIGNATURE POWER UPGRADE |
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| [ Standard RTR Spec 3 ] --> 3.0L Whipple Unit | 810 HP |
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| [ Signature Upgrade Kit ] --> Whipple Stage 2 | 870 HP |
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Base Spec 3 Upfit Hardware
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Base Vehicle Requirement: 2024+ Ford Mustang GT Fastback platform.
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Standard Supercharger Package: Gen 6 3.0-liter Ford Performance Whipple Supercharger.
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Standard Spec 3 Package Cost: Starts at $32,995 above the donor Ford Mustang GT MSRP.
Whipple Stage 2 Upgrade: Elevating Output to 870 HP
For owners seeking extreme output beyond the baseline 810 HP threshold, the Signature Package incorporates the optional Whipple Stage 2 Upgrade Kit.
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| STAGE 2 POWERTRAIN CALIBRATION |
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| [ 5.0L Coyote V8 Engine ] ---> [ Gen 6 3.0L Twin-Screw Blower ] |
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| [ Optimized Throttle Body & Fuel System ]|
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| [ 870 Horsepower Output to Rear Axle ] |
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Key Powertrain Enhancements
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Increased Boost & Fueling Calibration: Revised supercharger pulley ratios and high-flow fuel delivery management extract an additional 60 horsepower, pushing total system output to 870 HP.
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RTR by Borla Exhaust System: A purpose-engineered cat-back exhaust system optimizes exhaust backpressure while amplifying the supercharged 5.0L V8 soundtrack.
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Thermal Management: Heavy-duty air-to-water intercooler circuits stabilize intake air temperatures during consecutive hard acceleration pulls.
ℹ️ Technical Note: Delivering 870 horsepower through a rear-wheel-drive chassis requires precise throttle control and sticky rear tire compounds. High forced-induction torque on standard road tires can easily overpower mechanical grip at highway speeds.
Individual Studio Design: The Dark Side Theme Example
The defining feature of the Signature Package is the RTR Lab Design Experience. Instead of selecting pre-configured trim levels, the owner collaborates directly with RTR’s design studio to establish a cohesive visual theme.
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| RTR LAB CUSTOMIZATION PROCESS |
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| 1. One-on-One Design Consultation (Theme & Palette Selection) |
| 2. Digital Rendering & Visual Layout Approval |
| 3. Custom Paint Application for Aero Components & Accents |
| 4. Powder-Coating Wheels & Custom Decklid Badging Alignment |
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Bespoke Execution Details
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Inspirational Concept: The showcased Race Red Mustang RTR Spec 3-S was re-imagined through a concept inspired by the dark side of sci-fi universes, space geometry, and high-tech automotive minimalism.
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Custom Graphics Package: Motorsport-inspired vinyl and painted graphic overlays designed specifically for the S650 body contours.
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Color-Matched Aero & Accents: Factory-painted aero components, mirror caps, and LED air intake surrounds tailored to the selected theme colorway.
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Powder-Coated Wheels & Custom Badging: Heavy-duty powder-coated RTR alloy wheels and bespoke-colored RTR badges replace standard trim finishes.
Technical Specifications: RTR Spec 3 vs. Signature Package
The table below outlines the mechanical and visual differences between the standard production Spec 3 package and the upgraded Signature Package upfit.
| Technical Parameter | Standard RTR Spec 3 | RTR Spec 3-S Signature Package |
| Engine Configuration | 5.0L Supercharged V8 | 5.0L Supercharged V8 (Stage 2) |
| Peak Horsepower | 810 HP | 870 HP |
| Forced Induction | 3.0L Whipple Supercharger | 3.0L Whipple (Stage 2 Calibrated) |
| Suspension Architecture | RTR Tactical Performance Components | 30-Way Adjustable Coilovers |
| Exhaust Hardware | Standard / Optional X-Pipe | RTR by Borla Cat-Back Exhaust |
| Exterior Aesthetics | Standard RTR Aero Kit & Graphics | Bespoke Studio Graphics & Painted Aero |
| Upfit Base Price | $32,995 (Package Base) | $12,500 Base + $2,500 (870 HP Upgrade) |
Chassis Dynamics: RTR Tactical Performance Coilovers
To manage 870 horsepower effectively on track and street environments, the chassis utilizes RTR Tactical Performance Coilovers.
CHASSIS ADJUSTMENT & DYNAMICS LOOP
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| Full Ride-Height Height Adjustment Range |
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| 30 Clicks Simultaneous Compression & Rebound Tuning |
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| Adjustable Front & Rear Sway Bars for Roll Control |
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Suspension Tuning Features
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30-Click Damping Adjustment: Dampers feature 30 distinct clicks of simultaneous compression and rebound adjustment, allowing quick transitions between comfortable street cruising and aggressive track setups.
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Ride Height Adjustability: Threaded coilover bodies allow owners to set custom ride heights and corner balance the vehicle for optimal weight distribution.
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Elimination of Chassis Flex: Heavy-duty sway bars reduce lateral body roll during high-g cornering maneuvers.
⚠️ WARNING: Adjusting coilover damping settings too stiff for rough public roads can reduce mechanical grip. Overly rigid suspension prevents tires from maintaining contact with uneven pavement during hard acceleration.
Pricing and Exclusive Build Process
The Mustang RTR Signature Package is built exclusively at the RTR Lab.
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| SIGNATURE PACKAGE PRICING |
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| [ Signature Package Base Upfit ] ---------> Starts at $12,500 |
| [ Whipple Stage 2 Upgrade (870 HP) ] -----> +$2,500 (Spec 3) |
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| * Base Ford Mustang GT & Spec 2 / Spec 3 Package Sold Separately |
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Every completed build is personally inspected and signed by RTR Vehicles founder Vaughn Gittin Jr., reinforcing the vehicle’s provenance as a true coachbuilt performance machine.
Source: 2026 Ford Mustang RTR Spec 3-S: Ein Muscle-Car als echtes Einzelstück
✍️ Author: Bejenaru Alexandru Ionut – [email protected]
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