I found the same exhaust pipe/muffler would work on Jetfire with crossover or 4 barrel with Y pipe. It didn’t last, so I had one made from 304 stainless steel. Now days you can buy a 304 U pipe with very tight mandrel bend, weld it in (stainless MIG wire). I would look at BORLA and find a 304 muffler to fit the situation, stock mufflers didn’t last either. Since those days I have done this with every car, replacement pipes & mufflers are not a part of my life. Bruce Roe