I have approx 30 hours of engine time after installing the side pipes to the headers/primaries using Permatex only, no gasket. To date, no leaks.
**** QUESTION SENT TO PERMATEX
Tom.Dobruck@Permatex.com
Can the Permatex product 101 BR Ultra Copper Sensor Safe High Temp RTV Silicone Gasket Maker be used between the header extension and the
exhaust pipe/collector without any other type of gasket material ? The specific application is for the side pipes on a Cobra.
If not, is there a Permatex product for this application, w/o the use of a gasket material ?
****ANSWER RECEIVED FROM PERMATEX
Depending on the gap between the two mating parts, you can try using the Ultra Copper.
You can call the Permatex Tech Center 1-877-376-2839 and speak to one of our technicians.
If you give them more information they will be able to help you with your application.
Tom Dobruck
Marketing Communications
*** ANSWER by phone FROM PERMATEX TECH CENTER
Permatex does not specfically recommend using any of their products for the application mentioned without also using a gasket. It is " possible " that using Permatex only will work, but the mating surfaces must be perfectly clean and straight with a very minimal amount of surface deflection. The Tech emphasized, Permatex only may or may not work.,