i'm revisiting this idea guys, since im getting a pretty hefty tax return

. but anwway, now im debating between this setup, and the 2 others on 3sx: the tanabe concept or the JIC twin spartan. anything i get will be catback since this is a street car. now im wondering what kind of power increases i could expect from each of these, and whether or not the other 2 are worth the 500 dollars more, since the borla is cheapest. help?