Born in 1964, the Ford Mustang was the original American Pony Car, and the Shelby version that followed established its credentials as a bona fide member of the legendary US muscle car fraternity.

Based in Munich, GeigerCars.de has been a leading American car importer as well as performance and styling specialist for over three decades. It is thus no surprise that Karl Geiger and his vastly experienced team have created their own unique and special take on the latest Ford Mustang.

Labelled the Geiger Mustang GT 820, this car does what it says on the tin, an intercooled supercharger conversion extracting 820 hp and 760 Nm of torque from the 5.0 litre V8 that left the factory with just 421 hp.

• Supercharged V8 with 820 hp / 760 Nm
• Carbon-fibre body kit and forged alloy wheels
• Complete vehicle from 109,450 euro

The core of the GeigerCars.de engine upgrade is a charge-air intercooled 2.9-litre capacity supercharger fed by a cold air intake system. In combination with a machined engine block, balanced steel crankshaft married to forged pistons by steel connecting rods. With the factory output virtually doubled, an uprated engine cooling system is required to deal with the significant extra combustion heat.

Now producing a mighty 820 hp at 7,300 rpm, with 760 Nm of torque at 6,500 rpm, the forced aspirated V8 slingshots the Mustang’s performance into major league supercar territory. The complete engine conversion costs 34,600 euros.

A great soundtrack is an important part of any performance machine, and GeigerCars.de are happy to oblige with their 3,900-euro stainless steel sports exhaust. With its flap control wide open this exhaust gives the Mustang GT 820 a mighty V8 bellow that will raise the goose bumps on anyone within earshot.

To balance out the enhanced straight-line performance, GeigerCars.de use the GT Performance package, which includes a Brembo six-pot calliper big brake system, 3.73:1 final drive and Torsen limited-slip differential. The 1,950-euro Geiger-sports suspension kit is another vital part of the GT 820 conversion.

Figuring that GT 820 owners will also want to show off their cars unique status, GeigerCars.de offer a special paint finish (5,900 euros), and an in-house Carbon-fibre body kit (8,900 euros). This bespoke styling kit consists of a new grille, large front spoiler lip and matching side skirts. The rear is visually spiced up with an under body diffuser and boot lid spoiler.

To fill out the Mustang’s wheel arches and improve traction and handling, GeigerCars.de fit their black-painted Y-spoke lightweight forged alloy wheels in 8.5J and 10.0J x 20-inch sizes, shod with 255/35R20 and 295/30R20 Michelin tyres. This costs 4,300 euro for the set.

GeigerCars.de offer their Ford Mustang GT 820 as a complete car for only 109,450 euros. When you compare its specification to similarly powerful competitors, this makes it incredibly good value for money.

Specifications, Ford Mustang Geiger GT 820
Engine: Supercharged V8
Displacement: 5,0 l
Power: 603 kW (820 hp) at 7,300 rpm
Torque: 760 Nm at 6,500 rpm
Transmission: 6-speed manual
Consumption: City/highway/combined: 20.81/10.17/14.08 L/100km (Super)
CO2 emissions, combined: 328 g/km
Efficiency class: G
Emission Class: Euro 6
Base price: 109,450 euro