Background
The BMW M5 in its E60 incarnation was, and still is, generally considered to be one of the most complete and accomplished four-door sports supersaloons ever built.
As is usually the way with Alpina, the B5 took what was already an extremely impressive vehicle and went off in a different direction with it. They ignored the M5’s mighty V10 and replaced it with a supercharged 4.4 litre V8. They also replaced the less than perfect SMG transmission with a conventional torque converter auto box. Just 118 UK cars were built.
Launched in 2005, the Alpina B5’s rebuilt engine managed to more or less match the M5 for horsepower and absolutely spanked its Chris Bangle designed bottom when it came to torque.
Incredibly, the B5 delivered 133lb-ft more torque than even the savagely powerful E60 M5. The brakes were the biggest available from the BMW parts bin and were donated by a LWB 760Li. It did 0-100mph in 9.5 secs, with 125mph appearing 5 secs later.
Alpina’s fettling and tweaking makes the B5 an arguably more complete supersaloon than the M5. It has all the power and handling attributes of the M5 but somehow (how?) manages to add more compliant suspension and a better ride to the mix.
The Alpina's true trump card, though, is the way it delivers its power. Where the M5 gets going at high revs and needs to be constantly poked and prodded into a fury, the Alpina's supercharged V8 flings you towards the horizon with a thumping great slingshot of torque the like of which stays in the mind for quite some time.







