I'd be interested in feedback on this too. Im looking to get the tone on my roush ab's a little deeper. I got the gt500 valence and am welding quad tips on the roush. Hoping that might have a little effect. Even if it doesnt its going to look sweet!
2014 Black Mustang GT. Roush Axleback Exhaust, Airaid Intake, JLT Oil Separator, Black Billet Grille, Fog Light Relocation, 19" sve drifts with 275/40's, D2 Coilovers, BMR Panhard Bar, BRM LCA's and UCA, KOI and Oracle Orange Dip