From a previous post....
I would suggest sending it to Knights Autoworks, Steve Hemstock. Ph#715-702-2727. He has done many seats by removing the foam. Excellent work. You'll be hard pressed to know it wasn't stock. He also does a "wideman" seat.
Has anyone done the wideman seat you know of, as I'm curious how it worked/what was done. I could use a few more inches of width on the seat back personally.
I've had it done on both my cars. They work great! Still have support, but much more comfortable. I've had other (not so wide) people in my car and they have only noticed the height difference.