Niklas, thank you for posting the figures. But from my experience the wheels and engine figures do not quite look correct, are these figures from an official paper or from a dyno/rolling road.
I will explain why i think this, because on a rolling road we measure the power at the wheels, so if the dyno is set up properly it should read a good figure or there about, but for the engine figure the dyno will use software and coastdown losses etc to ’estimate’ the engine or flywheel figure. On a front wheel drive car the formula that is used to get to a ’ball park’ figure for the flywheel power is to add 10 to the wheels figure and divide by 0.9. So if we use the 142.5 + 10/0.9 = 169.4bhp, so this is quite a lot more than the stated figure. A good article too read is here http://www.pumaracing.co.uk/coastdwn.htm
But after saying this i personally think the power losses through the Saab gearbox are higher than on other cars with a more conventional gearbox.
Please excuse my ignorance, i think hk = horsepower, so what is dhk ?