Installed them today. Sound great, definetly adds something that was missing. Could be louder but very happy with the sound.

 

give them a little time to break in... bet they will get a little louder... i was looking at flowmaster

 

Not quite as fortunate to have stock duals on my 10 but Makeitblack is correct. When my true duals were new the were higher pitched then they are now, I really enjoy how they sound. Remember loud doesn't always = good