Reply to "Chirpy Exhaust Note"

...since you can not hear it around the header/head area; but hear it out the back of the muffler, the only idea I come up with is: could it be a break in the 3-bolt gasket that goes in the connection of the muffler/head pipe to the collector? Blowing/Sucking air. A chirp is 'likened' to a whistle, which in my thinking, may be caused by an exhaust leak!? The only other thing possible, that I can come up with is that a baffle may have come loose with-in the muffler, on that side. I might tap on the underside of the muffler with a rubber mallot; maybe you would hear something loose. I Sure hope you find the problem, a noise like that can become quit irritating. You may also try the 'hose to the ear' trick, as a stethiscope, to try and locate the source of the chirp. Good-Luck!