U.S. R32 Registry

So i got a flat. used my jack upside down cause i'm dumb and put on my spare. Went to the Dealership and they told me they didn't have the size tire for my car. So i asked about the slightly bigger radius tires and they put them on for me. I asked them if it would mess my car since i have all wheel drive. I've noticed that when i accelerated out of the parking lot my car jerked left and right, and seems like the jerk is coming from the back end. I went back to them and they told me it was because of the wear on my tires but i think he is just an idiot and i hate him. I will be buying two more tires to the same size as the ones on the front, but my question is....is my transfer case in danger if i take it slow to and from work which is half a mile from my house. I could easily walk but i like my sleep

I had my r32 for 4 hours, and my windshield was hit by a rock, and a small crack appeared. Luckily its smaller than a quarter (barely) and i can have it fixed for 40 bucks. I was also wandering about the HPA generation 2 haldex controller. is it plug and play or is there more to it, i don't know much about tuning cars, so i was wandering if someone could post instructions on how to install one, maybe some photos too.