yeah, they're super deep. I ended up mounting it on the end of a long skinny sealed box... that's where they're useful when 1 or two sides of the box are restricted. It's sits under my side facing jump seats and fires back toward the rear door. My amp could give it 375 watts rms, but it gets loud enough i haven't kept pushing it till something makes funny noises. House mates can hear it in the house when i drive up, so it's loud enough in the car. I think it would be a mean little ported speaker because it's ported size box isn't much bigger unlike many, but i'm a space freak and the infinity 10 actually fits into a smaller box sealed... but that may just be what they "say" since it played more tense... maybe it didn't get to breath too well or would have sounded better in a sealed box.
If i hadn't already started the project, i'd have been tempted to try mounting 3 Tang Band 6.5's in my rear door or under the rear seats. They make some that are surprisingly long throw... about 3 to get the displacement of the 8w7. THen it wouldn't take any space... but i might not get the low extension.