AP Exhaust 18123 Exhaust Pipe - Center

OE Replacement Exhaust Pipe for GM Vans

AP Exhaust 18123 is an aluminized steel exhaust pipe built as an original equipment replacement for select GM minivans. It is made for the center section of the exhaust system on 1997-2001 Oldsmobile Silhouette, 1999-2001 Pontiac Montana, and 1997-1998 Pontiac Trans Sport applications with the UM code.

Key Features

• Aluminized steel construction for corrosion resistance in everyday exhaust service
• Original equipment replacement design for direct-fit service on the listed applications
• Center exhaust pipe location for the factory exhaust layout
• Fits 1997-2001 Oldsmobile Silhouette, center
• Fits 1999-2001 Pontiac Montana, center
• Fits 1997-1998 Pontiac Trans Sport, center
• AP Exhaust 18123 for OE-style exhaust repair on compatible GM vans

Application Details

This exhaust pipe is intended for vehicles with the welded OE system noted in the fitment data. For the Oldsmobile Silhouette, Pontiac Montana, and Pontiac Trans Sport, the center section is part of the factory exhaust routing and should be matched to the vehicle’s code UM configuration. AP Exhaust 18123 is a practical replacement when servicing the center exhaust pipe on these models.

What It Helps Repair

• Rusted or perforated center exhaust pipe sections
• Exhaust leaks from a damaged welded assembly
• Noisy exhaust operation caused by a failing pipe section
• Restricted exhaust flow from corrosion or structural damage
• Factory exhaust fitment issues on UM-code GM minivans

Installation Notes

Verify the vehicle’s door decal code UM before ordering. The OE system was a welded assembly, so AP Exhaust recommends replacing all parts identified in the fitment notes during service. Confirm the center position and compare the existing exhaust routing before installation.

Quality Assurance

AP Exhaust 18123 is an original equipment replacement part made from aluminized steel for service on the listed Oldsmobile and Pontiac applications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.