I couldn't own a Subaru, every one I've ever heard running has a lower end knock that the owners can't hear. All the newer stuff is fussy about tire circumference differences because it affects the ABS and traction control, Ford says 3/8" circumference difference is the max allowable. We had a "customer" with a Town Car who put 4 ice radials on it then came in with traction control issues. He insisted the problem was there with the original tires. Most Lincoln owners drive smoothly, not this guy, he'd accelerate at WOT from a stop and the traction control would kick in and limit the car to 40 mph. After days of going through the TC system with a fine tooth comb, we swapped the wheels off a Crown Vic onto his car and the problem was gone. The hard acceleration was crushing the tread on the soft ice radials, effectively making the tire a smaller diameter and the traction control was kicking in because it saw the rear wheels were turning faster than the front wheels. He refused to believe me so we let him drive it with the Crown wheels for 3 days, then he grudgingly accepted the facts. He never paid for the week of labor, though, that's why he gets quotation marks around customer. One of my friends bought 2 tires from a local guy for his 04 Ranger at a "super deal". They were about 3/4" shorter than the other pair and the first time he engaged 4x4 it wouldn't disengage. He drove the rest of the way to work before the transfer case fragged. The guy who installed the wrong tires didn't feel he was responsible for the damage. He's another one of those independent mechanics who's "better than the dealer."