welcome welcome!!.... i would suggest ... ebay exhaust... it pretty much looks like helix turbo back (if i am not mistaken) . it sounds really really loud at WOT but it is quiet when you want it.. and cheaper (money factor))... so i paid 300 shipped for my exhaust plus 100 for the race pipe.. total i've spent = 400 for my turbo back exhaust! that's really really nice.... and sounds real deep..
p.s. = tubing is tubing.... no difference.. same amount of gain.
good luck.