I have had several different exhaust systems and still have some of them. Original car came with custom cats and 3" exhaust out the back with no muffler but it was quiet with the cats. I then went with one of the aftermarket y pipes like above. One of them broke somewhere and I then took some flanges, factory y pipe and a slp bullet muffler to an exhaust shop. Had them make some pipes from the flanges to the y pipe and then a pieced welded to the the bullet and a turn down. I don't remember what I paid the shop but I'm guessing anything a shop is going to do like that should run $200. The other parts I had laying around.

I'll see if I have anything you could use and you could get it with the connectors!!