Double exhaust?
 

Just wondering if it's possible to install a double exhaust on '08 mazda 3 which has single right now and if that's possible does anyone know where could i get that double exhaust system with different sound?

you just want double pipes out at the rear?
Moving to a larger pipe from front to back and having different positions for the resonator and muffler would give it a different sound by far. I'd find a custom welded job myself :)