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What is it?
The new and much improved version of the B5, which went on sale amid surprisingly low critical acclaim a couple of years ago.
Normally the word Alpina is sufficient to make us motor-noters go weak at the knees with admiration, but for various reasons the original B5 didn’t quite hit the spot. The main problem was that its chassis didn’t feel like it could handle what was being generated from deep within the engine bay, namely 500bhp and 516lb ft of torque.
And when you learn that for the B5 S Alpina has summoned yet more energy from the 4.4-litre supercharged V8, whose outputs have risen to 530bhp at 5500rpm and a whopping 534lb ft at 4750rpm, to begin with the omens do not look good. Extra straight-line performance was about the last thing the B5 needed.
Alpina being Alpina, however, means they haven’t just turned the wick up and left it at that. In fact, numerous other tweaks have taken place to improve the B5’s ride and handling. Which is precisely what we wanted to hear.
For starters the electronic damper control system (EDC) has been re-written and now features Comfort and Sport settings. There are also new 20in wheels wearing bespoke Michelin Pilot Sport tyres that, in conjunction with the new damper settings, should make a big difference to the way the B5 S goes down the road.
On top of this the test car also came equipped with £2500 worth of limited slip diff, hiking the price to a breathtaking £72,450 and enabling B5 S drivers to execute 200-yard power slides pretty much at the twitch of a big toe.

What’s it like?
If the big question is, does the B5 S now ride and handle how a proper Alpina should, the answer is very nearly a resounding yes. The 'very nearly' bit concerns the steering, which, at speed and under load through a quick corner, still lacks the lazer-guided precision you’d expect and want from an M5 wannabe. But in just about every other respect the B5 S is the car the B5 always should have been.
It now rides with the sort of mind-boggling refinement we have come to regard as common place on cars produced by company boss, Herr Bovensiepen, while the handling itself is way better than before, even if you are still acutely aware of the car’s 1720kg kerbweight during a direction change at speed.
Really start to use the power and you will still feel the tail end moving around slightly under load but the key difference is that movement now feels controlled, deliberate and usable even if you are brave enough to turn the traction control off.
As for the performance itself, it’s hard to think of any car with four doors that feels notably faster than the B5 S. In fact, I can’t think of a single example, not even the most loopy-soup offerings from AMG.
We haven’t verified the numbers yet but Alpina claims the car is good for 197mph and can knock off the standing kilometer in 22.1sec – half a second faster than the new £160,000 Aston Martin DBS.
From the way it surges forwards, with only a slightly soft throttle response in the first half second to separate you from the oncoming oblivion, the B5 S feels every inch as fast as they say it is. And its six-speed Switchtronic auto transmission works beautifully with the engine – even if you do end up leaving it in D once the novelty of using the finger buttons has worn off.
The only criticism we have concerns the way the supercharger seems to continue spinning occasionally, even after you’ve backed away from the accelerator. It feels almost as if the throttle has got stuck open momentarily, but it’s merely the result of so much energy and inertia taking a nano-second longer to calm down than you’d want. And in any case, once you’ve experienced it a couple of times it soon becomes part of the car’s hot-rod appeal.

Should I buy one?
It will be a rare beastie, the B5 S, but if you can afford the £69,950 Alpina GB requires for one, then why not?
You are unlikely to worry about the 294g/km the car produces if you are the sort of person who fancies owning a 197mph saloon. Nor is the surprisingly decent 23mpg combined figure likely to make much difference.
What’s important is that the B5 S provides a genuine alternative to BMW’s own M5 but with a less manic, more mature personality. And as a machine to use 365 days a year in the UK, it could even be a better bet than the real thing.


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m-power

I always see the Alpinas as the real AMG competitors not the M-cars.

///K

Yes, in terms of speed. However, M-cars have very good handling and speed isn't everything around tracks.

ateekt

Alpina colors are best-wearing-ever on wheels ...!

mc_blue

I think I prefer this to an M5, more subtle and better for everyday use.

Steve

This car is a real ALPINA made at buchole with an in house develiped engine. And it a dying breed.

These cars are getting fewer and fewer as the B3 and D3 biturbos are made on the bmw production line. witha little modification.

We should celebtrate such machinery before they are gone altogether.

mc_blue

Agreed Steve, these are proper bonkers Alpinas.