You have the VIN, you can call ROUSH and get the info from them on what they installed on that car. I'm pretty sure they would have a record of that...From there you can deduce what was installed after the fact (whether dealer installed or customer installed).
Matthew 26:52-54 / Go Pack Go!
1987 Mustang GT Hatchback - 2V Mod Swap In The Works
1997 Lincoln Town Car, PI Intake/Cams, Sofa-On-Wheels, "Fat Tony" we call it
2001 GT Convertible - D1SC / Geared / Cammed / 440wh 400wt - TOTALED 2/2019