Alan, you're right, it does sit a bit lower due to the 17" wheels and lower profile tires. They're
Goodyear Eagle F1 GS-D3 size 315/35/17 and 215/45/17. I lost about an inch of ground clearance. The stock 15" tires are about 26.6" diameter, and the F1's are 25.7" rear 24.6" front. The advantages are availability, Z speed rating, and apparently exceptional wet grip that I hope never to experience. Driving feel is much improved with the 17's versus 15's. The steering feels tighter and more connected and the ride quality isn't diminished. If you're not constantly monitoring road surfaces, whether you're driving 15's or 17's, the road debris is going to get you.