[10] In all, 375 units were produced, with several special editions such as the non-road legal P1 GTR and P1 LM among others having smaller production runs.

[15] British automotive magazine Autocar reported earlier in the year that a new flagship model, internally designated the "Mega Mac", was under development, with production set to be limited to 500 units.

[16] Other specifications included a 5 L (305.1 cu in) litre V8 that was set to produce 799 hp (810 PS; 596 kW), and performance supposedly rivalling the Bugatti Veyron.

Aerodynamic performance was quoted at 600 kg (1,323 lb) of downforce "well below maximum speed", a drag coefficient of Cd=0.34, and the revelation of the active aero components within the P1.

[20] McLaren Automotive Managing Director Antony Sheriff echoed the sentiment at the P1's Paris debut, saying that the P1's aim "is not necessarily to be the fastest in absolute top speed but to be the quickest and most rewarding series production road car on a circuit".

[24] The electric motor can be deployed manually by the driver or left in automatic mode, whereby the car's ECUs 'torque fill' the gaps in the petrol engine's output, which is considered turbo lag.

[25] The car has rear mid-engine, rear-wheel-drive layout and is equipped with a 7-speed dual-clutch transmission developed by Graziano Trasmissioni.

[4][27] The P1 has Formula 1 derived features such as the Instant Power Assist System (IPAS), which gives an instant boost in acceleration via the electric motor, a Drag Reduction System (DRS) which operates the car's rear wing, thereby increasing straight line speed, and a KERS.

The P1 also features bespoke Pirelli P-Zero Corsa tyres and specially developed carbon-ceramic rotor, caliper and brake pads from Akebono.

[35] In August 2013 McLaren announced that the production allocation destined to the Americas, Asia-Pacific and the Middle East was sold out.

[39] The first delivery to a retail customer took place at the company's headquarters in Woking, England, in October 2013,[8] with 12 units manufactured by mid November 2013.

[37] In January 2016, the NHTSA issued a recall for 122 2014–2015 model year P1 cars manufactured between 1 March 2013 and 31 October 2015 due to a faulty secondary bonnet latch.

[46] The weight of the P1 GTR was reduced by 50 kg (110 lb), achieving a power-to-weight ratio of 697 PS (513 kW; 687 hp) per 1 tonne (1.1 tons).

Additionally, the P1 GTR will brake from 97 km/h (60 mph) to 0 in 85 ft (26 m), and can corner at 1.54 G long with pulling a lateral acceleration of 2.5 g on the skidpad.

To celebrate 40 years since James Hunt won the Formula 1 Driver’s Championship, McLaren designed a livery for the P1 GTR that was inspired by Hunt’s race helmet, with a black base color combined with red, yellow and blue stripes based on his Wellington College colors.

The car was showcased at the 2016 Goodwood Festival of Speed and driven by Bruno Senna, the official McLaren P1 GTR Driver Program Mentor.

This conversion uses the same Longtail bodywork found on the one-off P1 GT as well as a modified rear wing, a larger front splitter, and louvers for an increase in downforce.

[52][53] With the production run of the P1 GTR complete, and prompted by their efforts in converting track-only P1 GTRs to road-legal specification, Lanzante Motorsport commissioned McLaren Special Operations' Bespoke division to build a further total of 6 new P1 GTRs for them to develop into road-legal P1 LM variants.

In order to convert the cars into the P1 LM specification, Lanzante Motorsport made changes to the drivetrain hardware (to increase power output), employed a modified rear wing and larger front splitter along with dive planes (to improve downforce), removed the air-jack system and installed Inconel catalytic converter pipes and exhaust headers, lightweight fabricated charge coolers, Lexan windows, lighter seats (similar to those used in the F1 GTR) and a titanium exhaust system, bolts and fixings (to save weight).

At the 2018 Goodwood Festival of Speed, Lanzante Motorsport, who had previously modified P1 GTRs to road legal specifications and developed the P1 LM, introduced a new special based on the P1 GTR.

The new car, called the P1 GT, was commissioned by two different McLaren VIP customers; one from the United Arab Emirates and one from Japan.

[58] Also called 'Beco', it is a bespoke version of P1 GTR commemorating 30th anniversary of Ayrton Senna securing his first Formula 1 World Championship.

[59][60] McLaren announced a sub-seven minute lap of the Nürburgring, which equates to an average speed in excess of 179 km/h (111 mph), but did not publish the exact time.