I’m finishing that last couple of items on the headers and catalytic converter assemblies before I have them ceramic coated. The headers and merge collectors have double-slip connections which are typically secured with springs similar to the one shown below.
Instead I used these cast stainless steel mounts. Note that the bottom flange is radiused to better fit the exhaust tube’s outside diameter.
The mounts are connected via a 1/4” bolt. After the coating is finished, the nuts will be replaced with jet nuts tightened just enough to prevent rattling. While they will allow less expansion than the springs, double slips don’t move much and retention is more for safety than anything else.
The O2 sensors were added to the catalytic converter assemblies. These saddle-style cast stainless steel weld bungs are a lot nicer than the standard ones because the flange is curved to match the OD of the exhaust tube. They are available from Vibrant Performance.
The short boss on the back side matches the size of a standard hole saw which results in a clean, self-jigging fitment
The saddle-style flange fits the OD of the cone well.
The next step is to have the headers, cutout tubes and catalytic converter assemblies ceramic coated.