2018-2019 Ford Mustang Gt 3.0" Dual Rear Exit Valve Cat-Back Exhaust System with Twin 4.0" Tips (21001) Sport - Extreme Sound Levels

If you got this far, you already know. Expensive but you really can't put a price on joy. The amount of endorphin elevating smiles and feelings this generates both inside and outside the cabin pays for itself ten fold. True therapy. Bonus is the valve. You can be obnoxious when out of town and the obligatory bridge and tunnel but quiet as kitten when not. It's all in the frequency.