Have a listen at this 2015 Mustang GT with the Corsa Xtreme catback exhaust.
M6G member rio16 recorded his newly installed Corsa catback exhaust at cold start, idle and normal driving (2000 to 3500RPM).
Even without headers, which Rio plans to install next week, it is a sweet sounding exhaust system.
Listen to all the VIDEOS in the forums.