you don't need to buy a system for another car, just the bends that our car needs and have a shop weld it together.

There are tons of local shops (to me) including a monro, that will do "custom" exhaust work. It would be about $250- whatever you want to spend to get this done with less work than modifying a system to fit.

depending on where you were going to start the custom exhaust, then you need a straight pipe about 6 ft, a 90, a 90, a 45 and a short straight pipe. (thats for a no muffler, no resonator system, you would need 3? 45s to make it around the k frame and a flex pipe and another 90 to fit it to the cat..

based on basic sizing and prices for a 2 1/4" pipe kit, you get all that plus extra for $140.

Mild Steel Exhaust Bend Kit, 2-1/4 Inch - Speedway Motors, America's Oldest Speed Shop

If you pay $200 in labor your about what a kit costs.

However locally i have two shops that will bend their own systems (crinkly) for about $300-350 installed in SS. There is another that will do mandrel bends, but its more welds then a single bent pipe, not that it matters, for about the same or a little more (more labor intensive)