They are 17" G-Racing Seki, they are pretty lite around the 17lb mark. I guess the performance factor is that they dont use runflats, so this makes the ride a bit softer, as the runflats have really stiff sidewalls making the the ride harsh. I also run a wider tire so this adds the handling character. The wheels are also quite inexpensive, they are replicas of Volk CE28's but you can buy 4 of these wheels for the price of 1 Volk. I kind of lucked into these on Ebay and paid around the $600 for all 4 including tires with 800 miles on them
. They look even better in person.