Okay so I have a 58 9-3 Aero 1.9 TTID. The exhaust part in question is either Saa9003 or Saa9004. It comes straight from the DPF and splits into 2 back boxes as an all in one part. It’s snapped and badly rotted on one side. Now finding a replacement has been virtually impossible. Any idea how much I’d be looking at to replace with a custom exhaust? Or does anyone know a GM alternative?