[Mr. Pockets]

You should never replace less than all four tires on the SVX, or any AWD Subaru. Replacing only the fronts means that there's a different rolling diameter in the front than there is in the rear. If the rolling diameter is different, front to rear, you will wear your transfer clutch much more quickly.

Honestly, if I looked at an SVX, and the front tires were different from the rears - even if they were the same brand but with significantly different wear levels - I wouldn't touch it. If I see somebody only replace the front tires, that tells me that they never rotated them to begin with, so the transfer clutch has seen a lot of wear anyway.