It would most likely be cheaper to have a muffler shop do you're exhaust. Depending on your area, the price can vary. Mandrel bent pipes are more expensive than the restrictive Crush bends but like you said, you're not all about performance, so the cheaper crush bends might benefit you. If the muffler is still good you might be able to salvage that and reuse it. Call different local muffler/exhaust shops, and price it out. I would stay away from buying a whole new catback exhaust system, especially if you're even considering to sell it. Honestly they're too expensive. That's just my