Theres a droning coming from the exhaust (possibly aftermarket). What can I do?
First, a crossover pipe seems to eliminate some of the drone associated with aftermarket exhaust systems. These can be welded in pretty easily in the Impala application, and can also lead to some performance increases. If you are using the stock exhaust system with aftermarket muffler or the muffler delete, or your exhaust tips point down on your aftermarket system, you may be able to eliminate some of the droning. Have your local muffler shop modify your system to point straight out of the back of your car, ala the Mustangs. This seems to reduce the noise by quite a bit. If you have been under your Impala, you will no doubt have noticed the weight hanging off of the RH exhaust flange where the converter pipe meets the intermediate pipe. The weight is actually filled with lead shot to dampen exhaust vibrations. This was added early in the ’94 model year (before Impala production started) to control a resonance in the exhaust. Now there is a new bulletin which covers adding a similar we
