I have the Magnapacks and it sounds amazing with an X pipe, catted or offroad (I have removable cats). With the catted x pipe, it sounded really nice and was loud, but it wasnt obnoxiously loud. The amount of rasp was just perfect too, didnt get raspy until after 3000 RPMs. But I removed my cats a few weeks ago and I havent looked back. It's much louder (as expected) and the rip in the exhaust sounds fantastic, but if you hate rasp, I wouldnt recommend it. I dont (or didnt) like rasp either, but the Magnapacks do it right.
That good ol' red (Boss 302), white (GT/CS) and blue (5.0)!
2008 Mustang GT/CS: 5 speed | FRPP 4.10 Gears | Bama 93H Tune | Magnaflow Magnapacks | Bassani O/R X Pipe | Airaid CAI | MGW | J&M LCAs | Saleens 19x8.5