BMW M4 vs KTM X-Bow

What's the difference?

To say the BMW M4 CS is a hot ticket in Australia is something of an understatement.

Consider this. There is an even more expensive one, the M4 CS Edition VR46 – at a cool $346,900 – and it sold out in less than an hour. Now, granted, Australia only got four examples, but still, demand was running hot.

That car makes this one, the regular M4 CS, seem like an absolute steal. It's only $254,900 (yes, the word 'only' is doing a lot of heavy lifting in that sentence), and it shares the same upgrades, and makes the same monstrous power, as the VR46 – for Valentino Rossi’s 46th birthday – only it does it for around $100K less.

See? A bargain. At least, that's how I'd be justifying it to myself if I had a quarter of a million burning a hole in my pocket.

So, this or a Porsche 911? Read on.

I know what you're thinking: "How is this thing legal?" And to be honest, somewhere between a rock flung from the tyre of a passing car colliding with my forehead like it had been fired from a pistol, and the pouring rain lashing my exposed face like a damp cat-o'-nine-tails, I'd begun wondering the same thing.

The answer is barely. The product of a years-long fight to overcome our import rules, this madhouse KTM X-Bow R is now finally free to roam Australian roads and racetracks - though, with sales capped at 25 per year to comply with the Specialist Enthusiast Vehicle Scheme.

The price? A slightly eye-watering $169,990. That's quite a lot, and places the X-Bow R miles above its closest lightweight, carbon fibre-tubbed competitor, the Alfa Romeo 4C ($89,000).

But then, the KTM X-Bow R is unlike anything else on the road today. Part super bike, part open-wheeler and all mobile madness, the 'Crossbow' is fast, furious and completely insane.

Expect no doors, no windscreen, no roof. On-board entertainment is limited to the turbo whistling behind your head, the car's standard safety list is as barren as the interior and the climate control is dependent on the temperature of the wind that's smashing into your exposed face.

And we couldn't wait to take it for a spin.