Had a local shop named Roadmaster Tire install the two new tires, and I now have a full-size spare should I need one. Handles great, but that's a pretty subjective thing; I've been riding on a donut for a month, so my idea of "good handling" is pretty messed up right now. Good tread depth, very stylish look for an all-season; to say that I'm happy with the purchase at this point is an understatement.
Picked up a replacement set of spark plugs (NGK BPR7ES, one degree colder than the stock plugs) at the local NAPA auto parts store to see if that's what's causing a problem I've seen lately: when I boost over about 10-11 psi, the car bogs down and occasionally backfires. It pulls like crazy as long as I keep it below 10 psi, however. The two possible answers I've seen for this have been a boost leak (which was my first thought), or poor spark. Since the plugs are one of the few things I didn't change when I got the car, I figured it's worth giving that a try before I start hunting for leaks (I already did a visual inspection, and found a couple of problematic clamps, but after sealing them up, I noticed very little difference).