If you want loud and full, your best bet is probably Flowmaster. Borla is not really any louder than stock. Magnaflow is pretty much a shiny overpriced glasspack IMHO and from close up pics I have seen of the Magnaflow system, a 5-year old child could probably weld better than what I saw; I also noticed in every picture I saw of it installed it wasn't centered correctly.

Flowmaster:
http://www.youtube.com/watch?v=-N2B_4SIRB4
http://youtube.com/watch?v=oX_7QP5c8Zw

Magnaflow:
http://youtube.com/watch?v=gMaJ_vW6nhU
http://youtube.com/watch?v=N45kPsgoJpE