Ok i originally posted this on 2005 mustang GT talk and i don't know how to move posts and i think tech talk is more appropriate for this question. JBA AXLE-BACK EXHAUST SYSTEM VS SLP Loudmouth Axle-Back Exhaust OR Boom Tubes. OK so i have a 2005 Mustang GT and i want to get a exhaust and I'm debating which one out of these three. I want a good LOUD throaty sound, and sounds really muscle and loud. I want to know which one is the loudest, has the most gains for HP and TQ, Give me your personal feedback with them and what you suggest, because i can spend all day long researching them but i know you guys know best. So help me please thanks.