health > school >/= $
it's not our fault you don't take good advice. suit yourself man. we're just telling you the truth, and being blunt about it. driving around breathing exhaust isnt a matter of money or not, it's foolish. you can pick up a cheap cat back from a junkyard for under $50. Sure, it's a stock exhaust, but I know my life is more important to me than money.
if you really had to you could get crush bent parts and pipe at an auto parts store and whip up a temp side exit for cheap.
or save a bit and i got more than enough 2.5" mandrel bends and straight pipe to do that exhaust.