The choice not to use a dual-clutch was due to the increase in weight of over 70 kg (154 lb), thus negating any advantage of the faster gear changes in a double-clutch transmission.

The engine has been designed at the request of Pagani to reduce turbo lag and improve response, achieved with smaller turbochargers, a different intercooler configuration and re-programmed ECU settings.

A water/oil heat exchanger reduces engine warm-up times on cold days and helps maintain a stable temperature for refrigerants and lubricants.

To minimise the use of pipes and fittings (and the overall weight of the vehicle), the coolant expansion tank is mounted directly on the engine.

[10] Hydroformed joints were developed to reduce back pressure and ensure a free flow exhaust.

[12] Air from the radiator is extracted through an arch in the bonnet at an angle that is designed not to affect the streamline around the body.

The side air intakes behind the front wheels create a low pressure zone, resulting in downforce.

The Huayra BC is named after the late Benny Caiola, a friend of Horacio Pagani, and the first customer for the brand enitirely.

The Huayra BC comes with a lighter titanium exhaust system, new aluminum alloy wheels, and a stripped out interior.

The Pirelli P-Zero Corsa tires used in this variant feature 12 different rubber compounds, and the suspension and wishbones are made of aeronautical grade aluminum, known as Avional.

[16][17] In reality, Pagani drastically overproduced the Huayra BC, producing 30 units instead of the promised 20, to the irritation of some owners.

[citation needed] After 2 years of development, the Huayra Roadster was officially unveiled at the 2017 Geneva Motor Show.

The rear engine cover also has a new shape to adapt to the roadster form and now has vents for efficient cooling.

Pagani has also used a new material for the Roadster called carbon triax, which is a tri-axis fiberglass meshed with carbon-fibre power bands.

[20] It shares few aerodynamic parts as present on the BC and has a modified version of the 6.0-litre twin-turbocharged V12 engine rated at 802 PS (590 kW; 791 hp) and 1,050 N⋅m (774.5 lb⋅ft) of torque.

The Roadster BC is claimed to generate 500 kg (1,102 lb) of downforce at 280 km/h (174 mph) due to its large fixed rear wing and aerodynamic elements.

On 16 December 2020, Pagani introduced the Huayra Tricolore, was built to celebrate the 60th Anniversary of Frecce Tricolori, Italy's aerobatic team.

It is unpainted except for a clear blue lacquer, and red, white, and green stripes from the nose along the top of the car's surface.

Inside, the Tricolore is equipped with white and blue leather seats with Italian flag stripes, and the Tricolori logo is embroidered into the headrests.

[41] In December 2017, Pagani introduced the Huayra Lampo (Italian for "lightning") in partnership with Lapo Elkann of Garage Italia Customs.

[43] It is powered by a twin-turbocharged 6.0-liter V-12 engine sourced from Mercedes-AMG that develops 852 horsepower and 811 pound-feet of torque, and revs to 6,700 rpm mated to a seven-speed manual transmission.