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i have a 1990 rocky when i accelerate a high pitch whistling noise comes from tail pipe i have changed muffler and cat. converter help its driving me nuts
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Total votes: 310
Most likely muck in the
Most likely muck in the silencer/muffler from other parts of the exhaust causing a constriction. Hit the bottom of the silencer to see if bits are in there if it rattles when hit, if so remove and empty it.
Check all the joints if exhaust paste has been used on them, if it gets inside the joint it may cause this