The Aston Martin Valkyrie is inching closer to production and we’re finally hearing what the model will sound like.

In a shot tweet, Aston Martin CEO Andy Palmer ‏posted one of the first videos of the upcoming hypercar. While the footage is computer generated, the audio is reportedly authentic and the car sounds amazing.

Aston Martin has been tight-lipped about performance specifications, but the company has already confirmed the Valkyrie will have a naturally aspirated V12 engine which could enable the model to have a 1:1 power-to-weight ratio. The engine is being developed by Cosworth which, in a since deleted tweet, said “We’re famous for breaking records and our latest engine, the Aston Martin Valkyrie 6.5-liter V12, will be the world’s most powerful naturally aspirated road engine with 1130 hp (842 kW / 1145 PS).”

The company hasn’t explained that tweet, but Cosworth CEO Hal Reisiger recently told Top Gear he wants the engine to have “two to three hundred more horsepower” than any other V12 which is used in a road-going model. The Ferrari 812 Superfast currently holds the record as its V12 engine develops 789 hp (588 kW / 800 PS). Adding 200-300 hp (149-223 kW / 202-304 PS) to that figure gives you an output that ranges from 989 hp (737 kW / 1002 PS) to 1089 hp (812 kW / 1104 PS).

While Aston Martin originally said the first deliveries of the Valkyrie would begin in 2018, it now looks like the model won’t go into production until 2019 or 2020. That seems plausible as Aston Martin has said the first Valkyrie AMR Pro deliveries won’t occur until 2020.

Speaking of the Valkyrie AMR Pro, the model will have a recalibrated emissions control system and a revised energy recovery system. Aston Martin has said this will enable the car to have a top speed of at least 225 mph (362 km/h) and a combined output in excess of 1100 hp (820 kW / 1115 PS). That will make the model more powerful than the road-going variant and give it a better than 1:1 power-to-weight ratio.