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You need to take the car back to where the exhaust was fitted.It's quite common to need a couple of goes at aligning the system,most likely cause is the rear box needs the clamp slacking and push the box on a bit more to clear the rear panel.It takes very little contact to make a dreadful noise.The engine flexes over under accelleration and moves the exhaust back and forth in it's rubber mounts.

2006-08-04 14:44:36
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Q: What causes an intermittent knocking sound from underneath a 1998 Vectra 1.6 16V while being driven when a new exhaust has been fitted?
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