What are you running for power? I had Corsa's and liked them OK when I was NA but didn't like the sound when I put the Turbos on, they became very raspy sounding. I also think they sound better with an H pipe as opposed to an X. You should check out the Zoomers http://www.zoomersexhaust.com/cat-backs/passenger-vehicle/ford-mustang-gt-4-6l.html They weigh half what the Corsa weigh and IMHO sound great. I have these on my car and really like them, they have ZERO DRONE.