I need a new cat-back as well, but am not interested in the Walker at all.
I definitely want a quiet, quality system. I think the Gibson would be too loud. I'd like to hear about the loudness of the borla, but I don't like their tips at all, and am unclear if the exit is rear or side. I've seen videos of rear exit, but the description says side exit. Maybe they changed the exit location like TRD did.
I like the idea of "better flow", but not sure if anything is ACTUALLY gained, and I'm really liking the idea of real quiet exhaust.
My current muffler is the Thrush, and I really like the slightly louder than stock sound, but it's not really a quality muffler, and the my clamp-on install was garbage.
Even though I like it, I'm wondering if I would like stock sound level even more.
Stay off my lawn.