Rear seate delete. This will house the battery, amps and some other electronic goodies. I raised the floor and the sides of the tunnel to help tuck the 3 inch exhaust and Borla mufflers. I made the muffler pockets extra tall so I can also add some heat sheilds to the mufflers as well. Help keep heat out of the electronics area. That piece in the center with over 100 small bow ties cut into is the speaker grill for the 10 inch subwoofer. 1/8 thick aluminum that was laser cut. There is matching laser cut grilles for the speakers in the package tray also. The bow ties are even smaller.