I don't like any of them, though the Cherry Bomb "Muffler" I have not yet heard, but the Cherry Bomb glass pack is a sound I hate.
If you want a rumble, look at Dyno Max mufflers. I have also used simple thrush muflers, the turbo styled units. They quite down on Cruise, sound meaty on accelerqation Summit racing has a set surplied with there kits slightly quiter than the Trush's. They were on my Duster.
Clicky the video link below for a sound bite of the Summit mufflers;
YouTube- 74 Duster Exhaust
280 HP and 20 mpg's? Keep that cam small! and that rear ratio high!
Oh, I got 17 MPG all day on this 318, a low comp. 1979 smog engine with a small Crane cam, headers, LD4B and a 600 cfm carb. The rear ratio was a 3.21 and stock sized tires.
