Thunder city QQ baffles are very good, tested for correct gas flow but quieter than normal "loud" baffles.
I have VIC Swept pipes and cut them down then installed a washer, deep but not too loud or restrictive.
I doubt the bike was returned because of an exhaust, are you sure the stage 1 kit was not a free dealer add on?
Victory Vegas 8 Ball 2009 (5 speed 100ci)
Stage 1 with Swept black exhaust / Ness bars / Lowered