I had spring blocks in the rear, with the tires at like 27 psi(8" wide z rated summer tires) and no rear seat, it hooked up better then i ever thought. I'm trying different spring ratios right now so i don't have to use the spring blocks. I've seen a gtp with air bags in the springs and pumps them up when hes at the track. Taking as much weight away from the rear is key.
Looks stock eh