It’s not so easy to say this, and it’s even harder to realize this is happening but guys: Audi’s 4.2-litre V8 is dead. The previous generation RS5 has been the last car in the line-up to have it fitted. So the new RS5 comes with a replacement that paragon of eight-pot excellence fitted in its handsome snout. It’s a 2.9-litre, twin-turbo V6, co-developed by Porsche. It’s already been doing service in the Panamera 4S since its launch, and in Stuttgart’s sportified limo, it’s a bit muted, and just a bit meh. The thrust shouldn’t be too much of a surprise: power is identical to the previous model at 444bhp, but torque is up 40 per cent to a healthy 443lb ft. 0-62mph is ruthlessly dispatched in 3.9 seconds. That’s only a tenth quicker on paper than the BMW M4 Competition Pack and bang on the benchmark time for the Mercedes C63 S coupe. But it feels much quicker and more dramatic than both – partly because of the hugely potent V6, and partly because the all-wheel drive system means the performance figures are achievable consistently. The V8 RS5 sounded fast, but the new one is fast. Massively so.