Yesterday was a sad day when I found out the headers would void the warranty. I guess if I thought about it I probably would have figured that out a long time ago since it dispenses with the two precats. So, I'm just gonna have to bolt on the Sho-Shop Y instead. As we've all read, with a good cat back the Y is gonna yield close to 10 HP. I've had my Borla on for about a year now and I love it. I just couldn't justify losing 2.5 years a warranty coverage. This is the type of part that Ford could blame all sorts of things on and void my warranty so I'll just have to wait.