Those Bride seats look pretty cool. I am coming over to the Z world from having bimmers and agree with the earlier posters that a lot more performance can be had on other mods than seats. If you are after something unique for people entering your car to see, than those would be a great statement. For performance I would do a lot of other things first. Doing things under the hood and body and doing the seats would be killer.
Man, those seats do look good.