I just got a Reatta and whilst checking out the different forums I came across an idea that could be used on our Fieros.
Dash down to your local Walmart or the like and buy a blood pressure cuff. Then slip it under the seat back upholstery and use to squeeze bulb to inflate or deflate to arrive at your comfort level. I haven't tried it yet but it sounds like a good idea. Would have been nice on the LOOONG drive out to the 35th. I understand that the corvette guys have been doing this for awhile.