Seat only weighs 15.4 Lbs, and is a great way to shave weight from your car.
I bought this seat some years ago with hopes of using it in a track car, but that project never got quite completed. I bought this seat from Solo Racer http://www.soloracer.com/poleposition.html
(description and pic is here).
It cost me over $900 with shipping etc... for this seat, selling for only $699