You can buy new pipe, muffler, and the catalytic converter as replacement parts that's specific for your car and bolt it in yourself. Check
www.partsamerica.com and
www.carparts.com and see what you can find. I ordered my catalytic converter from Parts America and still waiting for my muffler, already welded to the replacement pipe, to arrive from Car Parts. This is for my 84 Toyota Van. So far, my exhaust system is costing me $250. A LOT cheaper than to have an exhaust shop put in a new exhaust for me.