Those old saabs are pretty cool. I had a 900 turbo many years ago and got into some swedish cars, saabs and volvos. Unfortunately they're all FWD but saab had some really interesting design choices. In the 900 the transmission is below the engine and the input shaft runs through a sprocket and drives the transmission through chains, so when you go to change the clutch you don't have to remove the transmission. You pull the access cover, pull the input shaft out, and replace the clutch in between the input case and the engine block. The 900 turbo, tuned and with an exhaust, was a decent little sleeper though still, fwd, and understeers like an audi. The turbo saabs also had a system called APC which was basically a primitive electronic boost controller that used input from the knock sensor to dump boost if it detected any detonation. People, especially volvo guys, would put them on their tuned turbo cars. The volvos had similar engines (other than being 8V instead of 16V) and the system worked fine with a little work. You could put your bleed type boost controller on the car with a solenoid and if detonation was detected the APC would actuate the solenoid and dump you to wastegate spring pressure. Neat cars and not troublesome in my experience, but probably hard to find parts for now.
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