2001-2004 Chev/GMC Duramax Diesel “Cool Duals” Installation Instructions
Removal of stock system:
First using 15mm socket or wrench, remove four (4) nuts at flange located approximately under the passenger side seat. Remove rear exhaust from rubber hangers and remove the system from under the truck.
NOTE: If you have purchased the optional front pipe, Remove the stock front pipe on the truck by removing the exhaust hanger on the transmission using a 13mm socket, then remove the band clamp at the front of the pipe, then remove stock front pipe from the truck. ( Note: the band clamp will be re-used during the installation of your new MBRP system)
Standard installation:
Install the slip joint to the front pipe. ( Four Bolt Flange )
Install extension pipe into the slip joint (Installation tip: Temporarily hang the muffler and tail pipe in place using the two OEM rubber hangers and measure to the down pipe to determine the length needed) approximately 9―” needs to be cut off for extended cab short bed and 20″ for the regular cab long bed. Crew Cab Long Bed Trucks Require an 18″ extension.
Install muffler over the extension pipe(s)
Install the Over axle pipe over the muffler outlet, the muffler outlets will be in a vertical position. Install the second half of the driver side tail pipe to the over axle pipe using the frame hanger provided. ( Crew Cab Long Beds may require drilling )
Install the passenger side tailpipe over the bottom muffler outlet from the rear of the truck using the frame hanger provided. ( Crew Cab Long Beds may require drilling )
Install clamps around pipes where needed, be sure exhaust is in place before tightening
clamps. Starting at the front-pipe, tighten all connections.
Get pdf 2001-2004 Chev/GMC Duramax Diesel “Cool Duals” Installation Instructions
