I've had GT500 AB's installed on by 2013 CS/GT for a year now. Since then I have read about the resonator delete. Read every comment and was worried it wouldn't make a difference or I wouldn't like it. What a great $80 delete! Doesn't sound a lot different at low idle or just cruising along but getting on it brings a smile to my face. A different, unmuffled, tone and it sounds significantly louder to my ears. Glad I made the change!
2013 CS/GT Sterling Gray, GT500 ABs, no resonators, Ford Racing Performance Tune