The Huayra BC is a track focused version of the Huayra which was unveiled at the 2016 Geneva Motor Show. The Huayra BC is named after the late Benny Caiola, a friend of Horacio Pagani, and the first Pagani customer. The Huayra BC has an improved version of the standard Huayra's 6.0 L twin-turbocharged V12 engine having a power output of 755 PS (555 kW; 745 hp) as well as 1,100 N⋅m (811 lbf⋅ft) of torque. The dry weight is reduced by 132 kg (291 lb) to just 1,218 kg (2,685 lb), thanks to the use of a new material called 'carbon triax' which Pagani claims is 50% lighter and 20% stronger than regular carbon fibre, giving the car a power-to-weight ratio of 1.62 kg (3.57 lb) per horsepower. The Huayra BC comes with a lighter titanium exhaust system, new aluminum alloy wheels, and a stripped out interior. The tires are Pirelli P-Zero Corsas that feature 12 different rubber compounds, and the suspension and wishbones are made of aeronautical grade aluminum, known as Avional. The Huayra BC also has a new front bumper with a front splitter and winglets, deeper side skirts, and an air diffuser that stretches the entire width of the rear bumper with a large rear wing. All of the exterior components in the car are used to optimize downforce and drag. The Huayra BC uses an all-new Xtrac 7-speed sequential manual transmission. Pagani has stuck with a single-clutch gearbox because it weighs 40% less than double-clutch gearboxes. All 20 units of the Huayra BC coupé have been sold out.
 
Introduced in June 2019 on the CSR Racing 2 app, the Huayra BC Roadster is an open top variant of the Huarya BC. It shares the same aerodynamic parts as present on the BC but has a more powerful 6.0-litre twin-turbocharged V12 engine rated at 800 PS (588 kW; 789 hp) and 1,001 N⋅m (738 lb⋅ft) of torque. The 7-speed Xtrac sequential gearbox with Singke clutch used on the roadster is 35% lighter than a contemporary dual-clutch gearbox. The Huayra BC roadster is slightly heavier than the coupe and has a dry weight of 1,217 kg (2,683 lb) but is 30 kg (66 lb) lighter than the Huayra roadster. The monocoque of the roadster is constructed of carbon-titanium HP62 material to keep weight low and make the construction rigid. The BC roadster 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. In addition to movable active Aero elements, the titanium exhaust incorporates flaps in the catalytic converters to divert exhaust gases over the underfloor elements like a Formula 1 car's blown diffuser. Production of the roadster will be limited to 40 units only.