i have an 05 gt, my current exuast set is, l/t headers, x, and borla axel back, will i gain any hp switching to a pro chamber from the x

 

It would depend on if the Xpipe is catted or not. The Prochamber has the one chamber where it meets, so it basically acts as the same thing. If you were to pick up any more power, it would be very minimal. The only thing that would change would be the sound.