My 2001 Dark Highland Green Bullitt has a stock motor and exhaust. I love the stock Bullitt exhaust at high revs, so I've never felt the need to replace it... yet. Modifications include: 3.73 rear end gears, Eibach Sportline lowering springs, SVE caster/camber plates, SVE Drift wheels with Nitto Tires. I have 73K miles on her and she is my daily ride (when I am not riding my motorcycle). All parts modifications were purchased at Latemodel Restoration and I used many LMR parts on my my former '93 5.0 Sedan before I sold it to get the Bullitt.