I thought I'd share my before and after vids when I installed my Off-Road Prochamber today. The exhaust is stock, save for the Prochambers (now) and Ford Racing Axlebacks (GT500KR).
http://www.youtube.com/watch?v=m0vvLHWpHD4
Note: I did have a slight exhaust leak at the leg due to the clamp breaking.

 

I just found this last night. The 500s are similar to the Borla stingers aren't they? I've been kicking around the idea of a prochamber.

 

The 500s are a little quieter than the stingers but from what I have read, they don't drone nearly as much.

 

of ALL the mods i've done and changed...
i miss that pro-chamber the MOST, but i've vowed not to spend another penny on this car OR i'd get one.

 

What I'm expecting is a deeper tone further up the pipe. Does that sound about right?