Originally Posted By: buck91
Exhaust gas flows in pulses. I always though a tapping exhaust leak was usually at the manifold (near the cylinder exhaust port, gas only flows out when the valve is open).
Right. this is my understanding too. Tapping noise near the exhaust manifold can be an exhaust leak. The further away from the manifold the tapping noise is, the less likely it will be a leak causing it.