This frighteningly loud engine start-up is guaranteed to make you jump
If you think a Formula 1 engine is loud, you obviously haven't heard of the world of Can Am. Above is a video of a beautiful McLaren M8 which features a 7.0-litre naturally aspirated V8, and I'd say it's the loudest engine start-up I've ever heard.
It's one thing listening to it firing up and leaving the pits, but imagine being behind the wheel of that thing for an entire endurance race like the legends that were Bruce McLaren and Denny Hulme.
If you can think of a louder, earth-shaking car than this, tell me about it in the comments below!