RTR Vehicles Unleashes 870-HP Mustang Spec 5 For Half The GTD’s Price

• 2026 Mustang RTR Spec 5 is limited to 50 units.
• Supercharged V8 delivers over 870 horsepower.
• Pricing starts at $159,999, including the cost of the base car.

Crafted in close collaboration with the motorsport masterminds at Multimatic, the Mustang GTD is the most advanced and most capable muscle car Ford has ever made. But if you ignore all its handling wizardry and aerodynamic excellence, and if you’re more interested in just the brutalist looks and bewitching power that a modified Mustang can provide, RTR Vehicles has created the Spec 5, and it’s got even more power than the 815-hp GTD for roughly half the $300,000+ asking price of that limited edition. What starts life as a regular Mustang GT 401A with the Performance Package has been transformed into an extreme monster with unique styling that is arguably as aggressive as the GTD from a cosmetic standpoint, even without a massive rear wing, and it’s got more than 870 horsepower and 660 lb-ft of torque. Ready to Rock? More like ready to roast rubber.

RTR Spec 5 Comes With Your Choice Of Transmission

The Mustang GTD has an innovative eight-speed dual-clutch transaxle, but RTR has kept things simpler, offering buyers the choice of either a six-speed manual or a 10-speed automatic transmission. The engine recipe is also somewhat straightforward, with the 5.0-liter V8 receiving a 3.0-liter Stage 2 Whipple supercharger, an HD Race intercooler, and an RTR by Borla catback active exhaust system. Helping to put the power to the ground is an RTR Tactical Performance adjustable coilover system complemented by adjustable sway bars front and rear. 20-inch Aero 5 Evo forged aluminum wheels (in Forged Charcoal, Podium Champagne, or Vapor Silver) are wrapped in Michelin Pilot Sport 4S rubber and fastened to the hubs with an upgraded lug nut kit. Hiding behind the front wheels are two-piece brake rotors, completing the mechanical changes. The cosmetic changes are more extensive.

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The most obvious alterations come in the form of composite widebody front fenders and rear arches with tire cooling ducts. The same sort of material is used to extend the bumper and accentuate the rocker panels, and there’s a new fuel filler door. Carbon fiber is used for the front splitter, rocker splitters, and rear quarter splitters, while RTR’s signature grille with LED-enclosed air intakes and new grilles help further set the car apart. Badges, a graphics package with a windshield banner, and an RTR hood vent complete the look. Optionally, premium paint costs $7,500, and paint-to-sample finishes cost $15,000. One of these is the stunning Mystichrome finish that Ford deemed to tricky to apply to its GTD.

Simple Interior Upgrades For The RTR Spec 5

Again drawing parallels to the GTD, the interior is far more restrained and original-looking than the body of the car, with only an RTR shift knob, RTR leather-trimmed Recaro seats, and RTR floor mats being fitted. To make the cabin a little more special, a serialized dash plaque has also been included, reminding each of the 50 owners for the 2026 model year which example is theirs. Send another $1,199, and RTR will also install QuickFit Pro harnesses for each of the front seats. Pricing starts at $159,999, and with all the listed options included, you’ll spend $176,198. The best part? That price includes the cost of the base Mustang, which is usually around $65,000. Not bad when the GTD costs over $300k and offers less power…