Anyone got a limited slip differential in their Saab?

I’ve always been just a little bit curious about differentials in front-wheel-drive cars. I guess you could say I’m a visual person and diffs just don’t stand out on FWD cars like they do on RWD cars. On a RWD cars they hang out the back like a big metal appendage but on FWD they must be tucked away (almost) like a eunuch.
So when I was chatting with John from Elkparts a week or so ago, I was surprised when he told me that one of the bigger selling items he’s had recently is the Quaife Limited Slip Differential upgrade.
I guess in tougher economic climates, people tend to maintain and upgrade their cars rather than buy new ones. Hence the choice people seem to be making to upgrade their diff.
The geeky stuff.
Allow me to tap Wikipedia for this. I’m a technical lightweight and I’m not ashamed to admit it.
A differential is a device, usually but not necessarily employing gears, capable of transmitting torque and rotation through three shafts, almost always used in one of two ways. In one way, it receives one input and provides two outputs; this is found in most automobiles. In the other way, it combines two inputs to create an output that is the sum, difference, or average, of the inputs.
In automobiles and other wheeled vehicles, the differential allows each of the driving roadwheels to rotate at different speeds, while for most vehicles supplying equal torque to each of them.
The main advantage of a limited slip differential is shown by considering the case of a standard (or “open”) differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely–the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, and thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use, such as driving in mud, off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the angular velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some traction available on at least one of the wheels.
I’ve heard a lot of people talk about the Quaife unit John was talking about.
In fact, as far as I can remember, it’s the only brand name I can recall anyone ever talking about when it comes to diffs.
Although I do recall talking with one of Saab’s tech gurus in Trollhattan, back in 2007, and he had a limited slip diff in his Saab 9-5 that Saab had made themselves. They were contemplating the manufacture of them for sale back then.
So – the big question is…..
Has anyone ever done this modification to their Saab and if so, how did it turn out? The Quaife units aren’t cheap but then, they’re the ones with the impeccable reputation from street to industrial to motorsport uses.
What say ye?

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