Since my 91 legacy failed MOT (rust in wheel arches near shock mounts, rest of car looks great) I bought an Green metalic Impreza plus with the 1.6 and manual gearbox. This is my first manual subaru.

I know it has a 50/50 split between front and rear so how about running with different sized tires between the front and rear will it be a big deal (or less than with the automatic)? Are there any other things i should take more care of having an AWD compared to a FWD automatic. I guess there is no separate front differential but a part of the gearbox itself is this true?

Any other hints or advice is of course welcome.

Car is 1999 impreza plus with EJ161 5mt, no A/C, no ABS, no airbags (europe) with ~60k km (35k miles).

Yes its important that you have 4 of the same brand and size of tires and yes to the front diff being together with the tranny uses the same oil. Welcome to the AWD world hehe.

Congrats on the new wheels, rverdoold! I'd love to hear your impressions of driving it after being used to your Legacy.