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I'm Not sure if Sears still sells the Walker "Hemi" replacement muffler, but it sounded really nice too. No sure how it flowed.
The Walker Quiet Flow replacement muffler for B-bodies with a big block is part #21848. The economy version is part #18230. 2-1/4" inlet and outlet. The Walker catalog list this # for both the 383 and the 440. Rock Auto has the #21848 for $49, my local Napa wants $70 each. Walker does have a $50 rebate until May 31 on Quiet Flow mufflers. I don't know if this may be a problem or not, this muffler is made to fit other vehicles too, it also fits Chevy Astro vans, and older Buick LeSabres, so it might not have that Mopar sound. 
Brian - 1971 Dodge Challenger
"The Dodge, which was practically stock, just left the Mustang like you wouldn't believe."
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