Given the nature of the Stebro and the "BillStock" stock muffler (let's just say it's very similar to the Stebro design), it's almost as if the car sounds best with a large open cavity at the end of the exhaust system. Try 1.625 in OD pipe throughout, a 2 into 1 high flow secondary cat, a high flow resonator (the one Dayle offers works nicely) and the least restrictive muffler you can find - if you can't afford the Stebro muffler. Removing the primary cats will result in a resonance if you don't replace them with some other type of restrictive device (don't use any type of "normal" muffler, as you don't want material flaking out of them and fouling the secondary cat).
-Bill
p.s. while I don't have any sound clips of Billstock/Battlestar's exhaust, you can ask TOMSSVX, Benebob, Hoecrest, NEWSVX, etc. who were at the Subaru Challenge as to what they "heard" 
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'92 Fully caged, 5 speed, waiting for its fully built EG33
'92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension
'92(?) Laguna, 6 spd and other stuff (still at OT's place)
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