Yep that pack of 12 is enough to the boot and under the seats
I'm going to order another pack and do the rear arches behind the parcel shelf supports, and behind the rear 1/4 panel trims
It's definitely reduced resonance from the back. The acoustics have changed slightly as well as the exhaust at idle and part throttle is deeper and bassier, but quieter, if that makes sense. Just sounds a lot more refined and less boxy/tinny
Yeah the plastic load liner is dead handy. I'm always putting dirty stuff in the boot!