01-06 Chev/GMC 6.6L Duramax Diesel Extended Cab Short & Long Bed Installation Instructions
Removal of stock system:
1. Apply a penetrating lubricant liberally to all exhaust fasteners, hangers and rubber insulators.
2. Using a 15mm socket or wrench, disconnect the factory exhaust system at the four bolt flange located behind the catalytic converter. If the vehicle is not equipped with a catalytic converter disconnect the four bolt flange located approximately under the passenger side seat.
3. Remove the exhaust system from the rubber insulators and remove from under the vehicle. If a hoist is not available for use, it may be necessary to cut the tail pipe behind the muffler for removal of the system.
4. Unbolt the OEM hanger from the transmission and remove.
5. Loosen the factory band clamp and remove the stock front pipe. Some vehicles are not equipped with a catalytic converter. Do not discard the band clamp as it is required for the installation.
6. Remove the spare tire. You may not be able to reinstall your spare tire after the installation of this exhaust system.
Installation of MBRP Inc. Performance Exhaust:
1. Install the Front Pipe onto the factory down pipe using the band clamp removed previously. Do not fully tighten to allow for adjustment. For regular cab models, 3” must be removed from the non flared end.
2. Install the hanger removed previously by sliding the outside hole in the rubber insulator over the hanger on the Front Pipe and re-connect to the transmission.
3. Install the 4″ to 5” Adapter over the Front Pipe. Then connect the Mid Pipe to the 4″ to 5” Adapter at the slip joint placing the bend around and under the cross member. Regular cab models do not have this cross member. The Mid Pipe does not require cutting to fit crew cab trucks. For extended cab trucks, approximately 9―” needs to be cut off the end with the longest straight section of pipe. For regular cab trucks remove 2” from the end with the shortest straight section of pipe and approximately 11―” from the end with the longest straight section of pipe. (Installation tip: Temporarily hang the Muffler and the Tail Pipe in place and measure to the Intermediate Pipe to verify the length required).
4. Rotate the Mid Pipe toward the drive shaft and loosely install the Hanger Clamp with the shortest hanger. This will support the Extension Pipe during the Muffler installation. Regular cab trucks do not require the installation of this Hanger Clamp.
5. Crew cab & extended cab long bed trucks require the use of the 18″ Extension Pipe provided. This is to be positioned between the Muffler and the Mid Pipe. The 18” Extension Pipe is not required with short box trucks.
Get pdf 01-06 Chev/GMC 6.6L Duramax Diesel Extended Cab Short & Long Bed Installation Instructions
