Exhaust system, checking for leaks

WARNING: This page is about a different car, the 2008 Audi RS 4 and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

Start engine and let run at idle.
Seal tailpipes with cloths or plug for duration of leak test.
Check for leaks by listening at connection areas of cylinder head/exhaust manifold, exhaust manifold/front exhaust pipe etc.
Repair leaks detected.