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I hated comps, be sure to sit in a car with them first.. looks do not equal comfort or pain free driving for some folks
I drove two cars back to back, one with competition seats and with GT seats… GT seats were nice, but comp seats were much better for me. Recognize everyone has different body type, but they are awesome for me.
the seat bottoms from gt to comp aren't the same but the difference is minimal. theres an extra rib for sturdiness and the cushion is firmer. my z07 had everything im wanted BUT comp seats so I bought it and ddid the conversion. took about 5-6 hrs and best mod I've done to date
My GT's do have the bolster pumps to tighten up sides, but not all GT seats have that feature.. likely because of trim level I assume
what year is yours? In looking at various years, I have not been able to completely figure out why some years and which trim packages offered various seat types, color combinations, thread colors, etc.