Vehicle & Part Overview

The 1977 Austin Princess (the "Wedge") was produced with several engine configurations. For the 1800cc B-Series (4-cylinder) model, the exhaust system is distinct from the 2200cc E6-Series (6-cylinder), which utilizes a more complex manifold and twin-downpipe arrangement.

Because the Princess is a transverse-engine, front-wheel-drive vehicle, the front downpipe requires specific bends to clear the subframe and steering rack. While mild steel systems were original equipment, many owners now opt for Quality Reproduction Stainless Steel systems for longevity and improved exhaust notes.

Required Components for the 1800cc B-Series:


  • Front Downpipe: Connects to the manifold (Part Number: GEX1181).
  • Center Silencer/Resonator: (Part Number: GEX1182).
  • Rear Silencer (Muffler/Tailpipe box): (Part Number: GEX1183).
  • Manifold Gasket: Standard B-Series gasket (Part Number: GEG601).
  • Rear Link Pipe
  • Hangers and Clamps

Sourcing Recommendations

Finding "shelf-stock" mild steel exhausts for the Princess is difficult. New Old Stock (NOS) or stainless steel reproductions are the most common options.

1. eBay (NOS and Stainless Systems)
This is the primary source for New Old Stock (NOS) mild steel sections from brands like Unipart or Quinton Hazell, often found in garage clearances.

2. David Manners (BMC/BL Specialists)
A specialist in British Leyland parts, this supplier is a reliable source for specific hangers, gaskets, and clamps required for the "Wedge" era cars.

3. Rimmer Bros
While specializing in Triumph and Rover, they maintain a catalog for Leyland era cars and often stock stainless steel versions of these systems.

Safety & Fitment Notes

  • Specific Floor Pan Fitment: The Princess has a unique floor pan shape. "Pattern" parts (aftermarket copies) are known to knock against the rear subframe or hang too low. If a high-quality reproduction cannot be found, a custom stainless steel exhaust fabricator (such as Powerflow) can build a system directly onto the car to ensure proper clearance.
  • Gaskets and Hangers: Do not reuse old rubber hangers or the manifold-to-downpipe gasket. Replacing these is essential to prevent exhaust leaks and "knocking" against the underside of the chassis.
  • Material Choice: Stainless steel is recommended for long-term restorations as it will likely outlast the vehicle.
  • Engine Verification: Ensure the vehicle is an 1800cc model. The Austin Princess was never fitted with a 1000cc engine; smaller 1000cc (998cc) A-Series engines were reserved for the Austin Mini, Allegro, and Metro.
Safety Warning: While the exhaust isn't a steering or braking component, a leaking system is a major safety hazard. Carbon monoxide can easily seep into the cabin of a classic car through old floor bungs or window seals. Always ensure the manifold-to-downpipe connection is 100% gas-tight.