The Ultima RS is widely regarded as one of the most capable analogue performance cars available today. Built in the UK by Ultima Sports, it combines lightweight construction, a spaceframe chassis and V8 power to deliver genuine hypercar-level performance without relying on hybrid systems or driver aids. The recipe is simple. Low weight, high power and maximum driver engagement.

This 2023 example is a one-owner car and has seen effectively no use since completion, presenting far closer to a newly delivered car than a used one, with just 50 miles showing on the clock.

The car was assembled by Tony Castle-Miller of Middle Barton Garage, a respected name in specialist circles with years of car-building experience. The build took place between April 2022 and August 2023, with around £45,000 spent on labour, giving a clear indication of the level of care and attention that has gone into this car.

The car is right-hand drive and built around the latest fully updated RS spaceframe, using mainly 38mm x 1.5mm tubing and offering high torsional rigidity. It is further strengthened by a fully welded 45mm CDS roll cage with rear braces, all finished in satin black powder coat and panelled in 1.5mm NS4 alloy.

Aerodynamically, the car features a full-width 1780mm double-element carbon fibre rear wing, mounted on swan-neck supports and adjustable through nine positions from -2 to +14 degrees. It has been wind tunnel tested and is designed to transfer load directly into the chassis.

This is supported by a full suite of optional carbon components, including a front splitter with vortex generators, dive planes, brake ducts with turning vanes, side splitters, wheel arch vents and a rear diffuser. A Le Mans-style roof scoop improves engine intake efficiency without adding drag. The body itself is finished in white GRP with a high-quality gel coat, with a reprofiled front canopy, improved venting and airflow management throughout.

The interior is well specified, featuring leather Ultima RS seats designed for 75mm harnesses, an Alcantara dashboard, optional carpeting with colour-coded piping and air conditioning. There is billet anodised switchgear with red illumination, a stainless steel handbrake, wireless steering wheel controls and a billet quick-shift gear lever with reverse lockout. A front lift system is fitted and controlled from the dashboard, and the car carries its individual numbered build plaque.

Lighting is handled by the latest bespoke Ultima LED system, with sequential indicators, DRLs and integrated cooling. The laminated glass is fully certified for US and European use, and the car is finished with grey-tinted side screens and headlight covers.

The suspension is properly engineered, with unequal length double wishbones, extended front geometry and billet aluminium uprights with upgraded hubs and driveshafts. Nitron adjustable dampers allow full control over bump, rebound and ride height, and the hydraulic front lift system adds real-world usability. Steering is via a quick ratio rack with 2.1 turns lock-to-lock.

Braking is upgraded to the larger RS specification, with 362mm curved vane discs and six-piston callipers all round, along with adjustable front-to-rear bias and stainless steel lines.

Power comes from a Chevrolet supercharged 6.2-litre LT5 V8 producing 755bhp, paired to a Porsche six-speed manual transaxle and billet cable shift system. It is a well-judged combination, delivering outrageous performance in a car weighing just 930kg. The result is nothing short of explosive. 0–60 mph in 2.3 seconds, 0–150 mph in under 9 seconds and a top speed beyond 250 mph (gearing limited). These numbers place the car firmly amongst the fastest cars in the world.

The car sits on bespoke forged 19-inch one-piece wheels, finished in grey with RS detailing, wrapped in Michelin Pilot Sport 4S tyres.

Included in the sale is a nearly new PRG Prosporta Monza twin-axle enclosed trailer, which adds a practical element and makes transporting the car to events or circuits straightforward.

Overall, it’s a very well put together Ultima RS. Low use, high spec, and built by the right team. More importantly, it delivers exactly what an Ultima should, huge performance, low weight, and a driving experience that feels completely unfiltered.

Currently unregistered, this Ultima RS is fully road legal and can be registered for road use in its current form, with no modifications required.

Specification

Engine:

Chevrolet supercharged 6.2-litre LT5 V8 fuel injection powerplant 755bhp

Performance (LT5 V8):

0-60mph: 2.3 secs
0-100mph: 4.8 secs
30-70mph: 1.5 secs
0-150mph: 8.9 secs
0-100-0mph: 8.7 secs
Standing quarter mile: 9.2 secs @ 156mph
Top speed: 250+ mph (gearing limited)

Gearbox:

Porsche six-speed manual transaxle with anodized black machined billet quick shifter cable change system

Chassis:

Right Hand Drive
Fully updated spaceframe using mainly 38mm x 1.5mm diameter tube
Market leading torsional rigidity
Fully welded roll cage in 45mm CDS with welded rear braces
Powder coated in satin black
Panelled in 1.5mm NS4 alloy sheet

Suspension:

TIG welded double unequal length wishbones with extended length front wishbones
Precision-engineered billet suspension uprights, crafted from aircraft-grade aluminium. These uprights feature robust, bolt-in large-diameter bearings at both the front and rear, along with upgraded, stronger hubs and driveshafts.
Fully adjustable Nitron Ultima RS coil spring dampers for bump, rebound and ride height.
Ultima RS front ride height hydraulic lift kit

Steering:

Alloy sports Ultima RS quick ratio steering rack 2.1 turns lock to lock

Brakes:

Optional larger Ultima RS brake fitment of 362mm x 32mm curved vane discs all round with 6-pot callipers
Adjustable brake bias front to rear. All stainless steel TUV hoses

Wing:

Full car width 1780mm double element design in carbon fibre, designed with excellent rearward visibility. 9 different angle of attack adjustment positions starting at -2deg up to a maximum angle of +14degs. Curved carbon fibre wing end plates. Mounted on swan neck mounts which now transfer downforce directly to the chassis
Full size wind tunnel tested

Body:

White GRP finished in immaculate gel coat finish utilising the latest advances in pigment technology
Front canopy reprofiled to suit 19” wheels, with front active aero via twin exit vents, front wheel arch vents in body colour or carbon fibre option, radiator exit spine divider option, new front canopy hinge motion system to maximize maintenance access, additional venting
Optional carbon fibre Ultima RS front splitter with built in vortex generators
Optional Carbon fibre Ultima RS front dive planes
Optional Carbon fibre Ultima RS brake ducts with turning vanes
Optional Carbon fibre Ultima RS side splitters with built in vortex generators
Optional Carbon fibre Ultima RS side scoops with integral NACA ducts
Carbon fibre Ultima RS wheel arch vents
Carbon fibre Ultima RS rear diffuser option
Optional Roof scoop Le Mans style designed in the wind tunnel to provide a more efficient cold air engine intake, no extra drag with increased frontal area
Ultima RS badges recessed flush into body panels

Interior:

Ultima RS branded leatherseats with new seat grommets to accommodate 75mm width seatbelts
Alcantara dashboard
Optional Carpet for the floor and rear bulkhead with colour-coded piping
Optional Air conditioning
Stainless steel handbrake lever
Steering wheel mounted wireless switch gear
Satin black anodized switch gear with red illumination
Satin black anodized machined billet quick gear shifter with reverse lock out and grey anodized gear knob
Optional Front ride height lift kit dashboard mounted button controls
Ultima RS individually numbered build plaque

Lighting:

New LED latest generation bespoke Ultima RS front and rear light clusters, in-built fan circulation temperature control with sequential turn signals, DRL front and rear, start up and shut down sequencing feature, ergonomically designed

Screen:

Laminated glass. Full USA and European certified
Ultima RS side screens and headlight covers grey tinted

Wheels:

Grey bespoke design forged lightweight 19” alloy one-piece Ultima RS wheels with Ultima RS centre caps and Ultima RS engraving

Tyres:

OE fitment Michelin 19″ Pilot Sport 4S

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