I've got the Blastin Bob 11dB deletes (straight pipes). They sound great at WOT, but are still pretty quite at idle (a bit more grumble). Cruising is a bit better then stock too. The drone did increase, but not bad enough for me to regret install. If I had to do it again, I would. Check out vid.
Video of 11db resenator delete burnout - Photobucket - Video and Image Hosting