Removal of Stock System: 1. Separate the stock exhaust system at the slip joint by the muffler. Remove the rear exhaust from the rubber hangers and remove the system from under the truck. Figure 1 2. Using a 15mm socket or wrench, remove the two (2) bolts at the turbo flange and remove the stock system. Installation of MBRP Inc. Performance Exhaust: 1. Install the Down Pipe starting from behind the cross member and place it in the same position as the stock down pipe.