Ive got mined installed earlier this week. Whole catback exhaust from Magnaflow. It sure gives my 2012 focus a good pull. I asked Magnaflow whats the HP increase on this. They said between 9-15hp. It got a nice purr low growl not too ricey or raspy. I can enjoy listening to music as well. Well worth it. Paid $470 for the whole kit. Big savings.