So if I'm seeing the pics correctly, it comes with both catted h pipe and o/r h pipe? Doesn't mention it, but it is shown... If so, that seems very inexpensive for what you are getting. I tried checking out there website, but it is down for maintenance. www.2kracing.com has a bunch of their products listed, but nothing for the Mustang.
I emailed the guys at Brenspeed and they pointed out that there is only provisions for 2 O2 sensors instead of the required 4. They also noted that several of their customers did not like them.