The rasp is a byproduct of replacing the cats only. I've heard a few different cars that put on a 'straight-pipe' to replace the cats & the result seems to be the same...
You're on the right track by looking to replace other exhaust pieces to get your desired result, of better sound quality.
FWIW, my car sounds just fantastic w/ the entire AWE setup... 
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George B.
* '06 Porsche C2S AWE Full Exhaust System, EVOM Intake, H&Rs, Mansory LL TeK Body Kit on RG5s.
* '03 Mitsu Evo VIII 440 awhp SCCA Solo II SM Weapon...
* '90 ZR-1 Vette 368CI SGC built 'Factory Black Motor' (11.0 @ 130.2 & 11.2 @132.4 w/ the 368--sprayed 120 shot) 560 rwhp
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