DynoMax "Hemi" SuperTurbo. Simular to the regular SuperTurbo, but a bigger case and a bit quieter.
In Car Craft, about 15 years ago, it was rated as one of the best flowing mufflers, and I think the quietest when they did a muffler comparison story.

I'm Not sure if Sears still sells the Walker "Hemi" replacement muffler, but it sounded really nice too. No sure how it flowed.