[Sean Marconette]

With a hatch you will need to seal off the hatch to separate the trunk area from the driver's compartment no matter what you do. If it's a notchback, then you will still need to add the firewall. I have had tech people inspect how I sealed the hatch more than anything else on my car at multiple divisions. Since you have a notch back, you will need to cover the backseat and possibly the deck plate where the speakers/rollbar is. Make it seal good and no gaps otherwise it could be questioned.

Sean