First off I just want to say I love the sound. Coming from a full exhaust Mustang GT to a 4 cyl I thought I was going to not enjoy the sound as much but the sound on this car now is great. I had a two problems with the install though. The connecting pipes that you clamp down did not fit together so I had to take it to a shop to get expanded. Also the axle-back part of the exhaust was bent too much so it is sitting at an angle. Although the headers and x-pipe on the Mustang took twice as long, it wasn't as difficult as installing the exhaust on the Focus. I don't know if it was just my exhaust specifically that had this problem but I expected it to be much easier. As I said I love the exhaust sound and can't wait to pair it with a downpipe. If you buy the AWE exhaust make sure to check and see if the pipes connect correctly before you go to install.