Was hoping to use some of my own cleverness, but I think I'll steal yours instead.
I tried taking the top off the airbox. Was fun for about 5 minutes, then it got old real quick. WOT is the only place it sounds good, and its really loud there. Otherwise, cruising in 4th and giving it some gas did make a terrible noise, like I had a hole in the headers. Even my wife called it ghetto, and she's typically into it when I mod my cars.
Like you, I just want a little more sound. Guess I have a weekend project now.