Sorry for the confusion: It's not a JL Stealth Box.
It's a custom box that was sprayed into the passenger footwell. The amp is in the trunk, mounted to the "roof of the trunk" up by the rear seat release handle.
Yea - you lose some legroom. I decided not to cut the carpet and padding out (which would have saved some legroom) because I wanted to make it 100% reversible. Here's a picture of the finished speaker and the legroom lost. The carpet mat flips up over the top of the speaker and tucks in so you can't see it's there.