Exhaust System, Checking For Leaks
WARNING: This page is about a different car, the 2009 Volkswagen GTI and 2008 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.
-- Start the engine and let it run at idle.
-- Seal the end of the exhaust pipe temporarily, for example, with a cloth.
-- Have a second technician listen at the connections between the cylinder head/exhaust manifold and exhaust manifold/front exhaust pipe for leaks.
-- Repair any detected leaks.