Whats the loudest exhaust that can be put on a 2009 Sporster 1220 low?

I have a 2009 Harley Sposter 1200 Low, I Know it has a Vance %26amp; Hines exhaust and is pretty loud, but I dont know which one. I want the loudest I can get my bike. What should I look for and what can I do?|||Quit trolling.Or at least learn how to spell Sportster.|||^^^ hahahahahhahahahha!!!!|||30 inch drag pipes,you wont be fast but dam it will be loud!