I also use the Speedway shorty headers.
I used the ceramic booted plug wires.
The flange is thick enough not to leak and the welding was amazing.
The headers themselves are stainless but very thin.
The only issue I had was getting the exhaust welded to the header extension.
The SS is so thin the weld wanted to burn through the SS extension.
A great deal for the money spent.
https://www.ebay.com/itm/39456185808...3ABFBMzrrYiNti
$209.00
Longtubes
https://www.ebay.com/itm/26395067311...Bk9SR7DX4IjbYg
$270.00