I made my own sfc similar to griggs sfc. The materials cost was 33.00 for 2"x 2" x .120 x 20'. You can't tell i even have them unless you look behind the seats. In front they are about 1/2" higher then the floor (drivers side footwell shown)
(passengers footwell shown)
and are about 1" higher from the middle of the front seats
to about 2 1/2" higher towards the rear seats, the carpet fits under the sfc in the rear. The tubing had to be reduced to 1 1/2
to go thru the rear subframe past where the lower irs bolts attaches to the body
. The picture below is where the tubing goes thru the bulkhead (i used a black marker on the welds to locate where the rear subframe is welded to the bulkhead)
about 15 inches past the lower irs bolt. I also cut out a 14 gauge plate with plenty of holes in it to plug weld to the bulkhead and to weld the sfc tubing to also. I had more pictures but can't seem to find them.
and are about 1" higher from the middle of the front seats
to about 2 1/2" higher towards the rear seats, the carpet fits under the sfc in the rear. The tubing had to be reduced to 1 1/2
to go thru the rear subframe past where the lower irs bolts attaches to the body
about 15 inches past the lower irs bolt. I also cut out a 14 gauge plate with plenty of holes in it to plug weld to the bulkhead and to weld the sfc tubing to also. I had more pictures but can't seem to find them.