Dennis, RE:
I just installed on my 1961 S1 OTS, a SS headers / exhaust system crafted by Classic Fabs in the UK.
This is not the least expensive system you can buy, but in my estimation it is the best I've seen. My mechanic, who , pointed out to me all the things he thought were done so well.
You should go on the site and if interested further, talk to Jimmy Stewart who runs the operation with his son.
I have no financial interest in this, but I am so satisfied with the product, I had to pass it on to you. Good luck. Howard B.