I bought a used dsp stainless muffler and head pipe. I installed the head pipe no problem. From reading other posts I guess you seal the mid pipe with high temp gasket sealer. Do I also use gasket sealer where the mid pipe attaches to the muffler? It is held on by springs(they were missing) and seems like it will leak allot of air. Any help from someone who bought this pipe new would be greatly appreciated.