I'm a little embarrassed to tell you guys this... but, whenever my local parts place runs out of my favorite brand of muffler grease, I just use a little dab of KY Jelly. It changes an off-sounding muffler to a "deep-throated" roar.

Try it sometime. You'll be very pleasantly surprised by how the women react to that KY Muffler sound... Be sure and let all of us know it works for you.

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1977 Mercedes 240D. 4-speed transmission. Windows, A/C, and sunroof: all manual. Medium Red. 204K miles.
1988 Subaru GL wagon. Dual range 5-speed 4X4. Daily driver w/ twin parts car.
1994 Subaru Loyale wagon. 5-speed 4x4
1966 International 3/4 ton 4X4 truck. Ooh yeah!
1952 Ferguson TO-35 farm tractor.
1984 Snapper rear engine riding mower. Just like Forest Gump.
1988 Nimble 20 sail boat
--Older stuff is built better--