Removal of Stock System: 1. Apply penetrating lubricant to all fasteners, hangers, and rubber insulators. 2. Loosen the nut on the band clamp located behind the catalytic converter using a 15mm wrench or socket. 3. Remove the muffler and tail pipe from the OEM rubber hangers. On 03-04 trucks remove bottom shock bolt of the passenger side shock to remove the system in one piece. This is not required on 05 and newer models.