You should be able to tell how healthy the motor is when you take it for a drive, if boost comes on smooth and without any sort of hesitation that’s a good sign. Of all the Subaru’s i’ve had compression tested, the ones that failed coincidentally had blow of valves installed 🤔 Not a great idea on Subaru’s I’ve heard so may be a good indication to stay clear.
I’m all about driver feel mods so things like upgraded bushings, ergonomic / weighted gear knobs etc. For handling I wouldn’t worry about strut bars and would highly suggest you look at sway bars as they’ll do a lot more than strut bars (reinforce lateral movement in the wheels as opposed to just putting more metal on top of metal (strut bar).
Didn't really know about the secondary turbo issues, thanks for the heads up on that one. Would have done some redline testing anyways, because I feel that you should do that when looking at a new car anyways. Didn't really think about a 91 tune actually, wonder how much power they lose when tuned for different octane ratings. You don't happen to know anyone around my region who could do road tuning when the time comes for myself do you?