I have always felt the best sounding mufflers of all time were the "original" THRUSH mufflers.
NONE of the mufflers of today come close to the sound they used to make.
With the growing interest in having a "period correct" look you would think Thrush would start making this muffler design again.
This style muffler came in a "short" & a "long" version. As great as the sound was these mufflers were not known for longevity.
With modern day materials & building processes I don't know why these popular mufflers of the late 60's early 70's are not available to us today in a new "long-lasting" nostalgia version.
The current "Thrush Welded" muffler does have a good sound but nothing like the Thrush muffler of old. The Thrust Welded muffler is styled like the early Thrush "Hush" muffler design which is also like Magnaflow, Flowmaster, etc mufflers of today.
I am currently using the short Summit Racing GlassPack Mufflers (18"). http://www.summitracing.com/parts/SUM-630810/
GREAT LOUD sound but not the LOUD "DEEP" sound of the original Thrush Mufflers.