An extract from Parker's Guide says it all about the M5: Quite how BMW will follow this car is hard to imagine, but, two years into the model's life a rather practical Touring version appeared which is only a fraction slower than the four-door. Under the bonnet is the kind of power that's normally reserved for Ferrari and Lamborghini owners. It's a 5.0-litre V10 with 507bhp (more than 100bhp per litre) which has been tuned using Formula One style techniques. Power delivery is smooth and accessible, the interior is refined and comfortable and the ride is supple enough to soak up most bumps | 