well we have discovered some new light weight seats.
you can get 4 in the car, but modification would be needed for the back two seats.
they could be as cheap at £50 fora set depending where you purchase them from...
well here they are , as you can see in the pictures they are unfortunatly useless in the rain, so would be better used for time attack/santa pod sessions where you can replace with your original seats after use
they also have amazing ability to keep your face and head cool in the hotter months.
http://img.photobucket.com/albums/v717/sp33d12/seat2.jpghttp://img.photobucket.com/albums/v717/sp33d12/newseat.jpgpm me if your interested in a set