The bench seat itself does not bother my back, wrestling it OUT of the car by myself was what did it.
The seats in my car are fixed, high back buckets from an '80s Jeep Scrambler I got free from the dealership where I used to work. I used the aluminum S/S seat brackets to mount them. They are 22lbs TOTAL including the brackets and new seat covers. Not kidding! They weighed LESS than the A100 van seats I have. That's around 55 lbs from the center of the car.
I'd re-think it, hard to toss that much weight as easily as that. If you only put one racing seat back in you'd probably be shaving over 70lbs.
Losing 100lbs = 1/10th reduction in ET, all else being equal.
