Ok, first, here's the system:
- Digital Designs M3 amp
- Memphis Mojo 15" Quad Coil
- Custom box, 3.75u ft (before displacement), 4x 4x18" aero ports (external)
- 2004 Impala
Ok, the system was doing 147.2 no problem yesterday, we sealed the rest of the trunk (back plate, sides, rear deck) and can't get over 146.3 now ... any ideas?