Raise the front of the car so that you can slide under it quickly. When the exhaust is completely cold, start the car and immediately check the couplings/joints at the cat for leaks. Be careful, the heat builds rapidly by design.
Also check the area where the tail pipe joins the pipe coming from the converter. This is a pressure fit with a simple clamp. Many times the tail pipe is not pushed forward enough before securing the clamp and a small amount of exhaust will leak out there.
Klaus
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(V♂LV♂s 1995 854T, 1998 V70R)
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