I am looking for a place to repair the exhaust on my Car. The Front Pipe has the Down Pipe, the Flex Pipe, and the Catalytic Converter. The Rear Pipe has everything that is behind the Catalytic Converter. I want to save the Front Pipe by replacing the Flex Pipe, and the Flange that is used to connect the Front Pipe with the Rear Pipe. I am replacing the Rear Pipe with a New Rear Pipe. Any Recommendations?