I had an exhaust leak on my mustang since I bought it. The exhaust gasket was gone completely. I used PB blaster on it for 2 days in a row then nut came off on the left side and whole bolt came off on the right. Yay! Everything went back on like a breeze too.
I was told that I should see "some" performance increase, but this car is like night and day. Lots more power and smoother acceleration. (hopefully better gas mileage too.
Just wanted to share...
-Joe boster