Even 17's look a bit small on 6th gens. But that's what i'm going with. You still have a decent sized tire, comfort shouldn't be that bad. It will be fairly similar to many new cars with large wheels. As for performance, it isn't necessarily hindering. A lightweight 16 will defineatly help performance over stock. 17's, maybe, as the tire gets pushed further out. But with lightweight 17's, you still can have the same or better performance. I remember a company, velox, had like 11lb 17's back in the day. The problem is everyone gets heavy knock offs and make it seem like getting rims hurt performance.