I've got an 09 Mustang with a V6. Sounds great, but I want more roar! (WITHOUT getting a new engine!!!) Any suggestions?

 

I would check out youtube

 

^^+1. Check out Youtube for some exhaust clips and find out what you like best!

 

find a car on youtube with the same mods you have (assuming you have mods) and listen to the exhaust. find one with similar motor mods to you and go from there

 

Yes, definitely check out other vehicles and see what has been done to them. Your easiest mod will of course be the exhaust, but there are a few other small tweaks that you can do to an engine that will make it sounds different, too. Just remember to find one you like and make sure you are happy with the sound before you start working on your car.