[4][5][6] The Beast contains a 2.4 liter supercharged I4 with a dual overhead camshaft and intercooler, producing 300 hp (224 kW; 304 PS).

This car contains a chromoly tubular chassis and a dual-layer carbon fiber body without doors.

[8] The weight is 750 kg (1,653 lb), setting the car's power-to-weight ratio to 666.6 hp (497.1 kW; 675.8 PS) per ton.

The Beast also has the original Ariel Atom brake calipers and discs installed, and has a custom horn.

[12] Even though the Alpha is not a base model, it is cheaper than its speedster counterpart at US$95,000 due to price drops after its debut.

The name Alpha slightly resembles this lower specification rating because of its usage in early models before their final product.

The Beast X contains the 2.5 liters Cosworth I4 but is turbocharged, this time by a pair of Borg Warners.

Combined with a curb weight of 750 kg (1,653 lb), the car has a power-to-weight ratio of 933.3 hp (696.0 kW; 946.2 PS) per ton.

There are new added aero gaps and fender grilles, and also a new split spoiler that loosely resembles the Pagani Zonda C12.

The front and rear have been revised to add extra downforce, along with the gaps, grilles, and spoiler.

The car features a body made from carbon fibre, sidewinder doors, a signature element of Beast Alpha and a 2.5-litre turbocharged Inline-4 engine developed in collaboration with Cosworth producing 700 hp (710 PS; 522 kW).

[25] In 2024, Rezvani announced a new generation of the Beast based on the Corvette C8 platform, with a twin-turbo 6.2-liter V8 producing 1,000 hp (750 kW; 1,000 PS) and a starting MSRP of US$449,000.

Jay Leno featured a review about the Rezvani Beast on his YouTube channel.

The car was already difficult to drive, but Glucker mentioned that Rezvani had slightly altered the wheelbase to give better stability.

[27] Matt Farah reviewed a Beast, and drove it down the Ortega Highway of California State Route 74.

He did mention, on the positive side, that the styling was beautiful, it was quick, and the supercharger made the car sound good.