I'm interested to hear this setup also. I have heard many 4.6 cars that sounded great with the Prochamber, but no 2011+ yet.
I just added the Lethal O/R H to my GT500 mufflers...It's pretty loud!
Base 2012 GT Kona Blue/Charcoal 6MT
Ford Racing 2.3 Whipple 3.25 Pulley (10psi), JLT 123 CAI, Kooks Super Street Headers, GT500 Cans, O/R H, JDM 93 Tune, JLT Can, Roush E Springs w/ Strange 10 Ways, Steeda K-Member Brace, J&M Panhard + LCAs, Whiteline Relos, Brembos and the very first modded Whiteline trans