Audi A8 vs BMW Alpina B5

What's the difference?

Audi’s flagship is the A8, a long, luxurious sedan where being driven is often as important as doing the driving.

To put this ultra-premium machine in context, it competes with other German heavyweights like BMW’s 7 Series and, of course, the Mercedes-Benz S-Class as well as Porsche’s Panamera. Not to mention the Lexus LS or Maserati’s Quattroporte.

What’s life like at the top of the Audi pyramid? Stay with us to find out.

The BMW Alpina B5 Bi-Turbo is not actually a BMW. Not according to the German Federal Motor Transport Authority, at least.

Nope, the modifications applied by tuning house Alpina to the 5 Series are deemed so significant that if you open the bonnet and look inside the engine bay, you'll see that the BMW VIN has been struck through twice and an Alpina vehicle number stamped underneath it. 

The B5 is not the first model to be recognised in this way, either; the German government has recognised Alpina as a seperate car manufacturer since 1983.

The B5 has other ‘B' siblings, too. There's the B3 S Bi-Turbo, which is based on the BMW 3 Series, the B4 S Bi-Turbo (the BMW 4 Series) and the B7 Bi-Turbo (I don't need to tell you what this is based on, right?) which I've reviewed, too.

So just what has Alpina done to this unsuspecting BMW 5 Series? Is it really worth the extra money? How does the B5 compare to an M5? Could it actually be superior? And did they really take the speed limiter off to let it warp-speed to beyond 300km/h?