Removing Tailpipe

Information 

• The tailpipe must be cut all around along the weld seam. 
• At least 26 mm of straight exhaust pipe length must be left all around after the cut is made. If insufficient exhaust pipe length to reliably secure a tailpipe using a screw-type clamp is left protruding from the rear silencer after the tailpipes are cut, the rear silencer must be replaced as preliminary work (the rear silencer has a longer exhaust pipe). 
• The cut must be made at the border of the weld seam at the exhaust pipe so that there are no weld seam residues to roughen and mill. 
• The surface of the exhaust pipe must not be roughened, ground or milled. These processes produce a rough and uneven component surface on the exhaust pipe, which prevents reliable fixing of the new screw-type clamp. 

1. If control boxes for exhaust valves are fitted, remove them to allow better access.
2. Cut off welded tailpipe with an extra-thin, suitable cutting disc (e.g. high-performance cutting disc Nr.129-1  ) at the second weld seam downstream from the rear silencer (illustrated position) → Cut on welded standard tailpipe  . Remove the tailpipe. The straight exhaust pipe must remain.
   Fig 1: Locating Cutting Area On Welded Standard Tailpipe

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. Rework exhaust pipe and prepare for assembly of screwed tailpipe.
   • Deburr saw cut on inside and outside of exhaust pipe.
   • Using a sharp hand chisel, carefully chip off remaining weld spatter on exhaust pipe by hand.
   • If necessary, manually restore exhaust pipe to roundness.
   • Manually remove rust from surface using suitable polishing agents (abrasive cloth).
   • The exhaust pipe must not be roughened, ground or milled. These processes produce a rough and uneven component surface on the exhaust pipe, which prevents reliable fixing of the new screw-type clamp.  → Prohibited roughening process on the surface of the exhaust pipe  → Calibration of exhaust pipe 
     Fig 2: Caution For Roughening Process On Surface Of Exhaust Pipe

     Courtesy of PORSCHE CARS NORTH AMERICA, INC.
     Fig 3: Identifying Calibration Of Exhaust Pipe

     Courtesy of PORSCHE CARS NORTH AMERICA, INC.

1. Correct, round exhaust pipe. Clamp can make contact around the full circumference.
2. Exhaust pipe with rough contour caused by grinding and roughening processes => clamp cannot be securely mounted. Clamp cannot  make contact around the full circumference.