Best: Aftermarket door speakers, 40% tint all around including windshield, Steeda shift bracket, and LED map/license plate lights
Worst: Roush axle backs because they pop too much and are raspy at 3k RPM, but it still sounds mean
Did you have the base model radio? If so, what speakers worked well? Did you do it yourself? I'm not a audio fanatic but the base model set up is "functional" at best.