I have a Blow By Racing (BBR) 93 Octane custom tune and a Steeda CAI. I haven't experienced any other tunes. All I can tell you is there is a very significant difference between stock and my current tune. It feels like a much more aggressive version of the stock car. There is no question that I have gained the claimed 40 or so horsepower and 50 or so ft lbs of torque.
The CAI also sounds awesome sucking up the air. The CAI, the Coyote, and the GT500 Axlebacks really come together to make a beautiful symphony. I have had the car for a little over 2 months and I have not played a note of music in it. The audio system is untouched.
2014 Base GT Black, 6-speed Manual, Tech Package and 3.73 Gears
MODS: GT500 Axlebacks / Cat Delete / Pypes X-Pipe / Strut Tower Brace / OEM leather seats / Black 19" Brembo Wheels / Steeda CAI / BBR 93 Oct Tune / Roush Lowering Springs / BBR Panhard Bar / Whiteline LCAs / Barton Shifter / 8 Ball Shift Knob / JLT Oil Catch Can / Shorty Antenna / RTR Chin Spoiler / CDC Grill / Drilled Rotors / Black Calipers / Hawk HPS PADS