My suggestion about using an old Jag XJ6 exhaust system includes using all the pipes and mufflers. There are two mufflers on each side. Everything is made of stainless steel. There is no rust or deteriation on these parts. The pipes are 1.75 OD and they work better than anything I have tried so far. They sound is fairly quiet yet you can hear them.

As for headers, I make my own. The dual headers I now use are made from 1.5 OD tubing on the single port and 1.626 tubing on the siamese port. They are 17.5 inches long and merge into a 1.75 OD collector with a Flange at the end. The exhaust pipes are 1.75 as well. When I drag race the car I disconnect the system at the mufflers. It sounds like a B-29 going down the track. My best 1/4 mile is 15.9 sec. and 89 mph. I do the 1/8 mile in 10 sec. and 70 mph.
Good luck with your car. Frank

FranK Hainey