If you plan to post to Classified forums, you must follow these rules, or your post will be deleted.
I know you are looking for a used stealthbox so this might not be your thing and I don't know what kind of sound you are going for but I took out that storage compartment and had a custom box built in for JL Audio 10TW3-D4 Subwoofer. I think it sounds great for a wide range of music...and I didn't lose any cargo space.
Sorry, didn't realize you guys replied to this thread. I'll look into the the q logic box, that's an option. Papabeach, what was the cost for your custom box if you don't mind?