Welding Exhaust Leak. The best thing to do in this case is to take your vehicle to a muffler repair shop that can weld in a new section of pipe or component to make sure your exhaust system is leak tight. Steel is much easier to weld.
While each option can be beneficial here are some exhaust tips to consider before coming to a conclusion. The most important part of welding the manifold is the preparation work. It holds strong but just doesnt seal very well maybe ill try jb weld there.
After cleaning with a hard brush sand the affected part down if youve got any sandpaper.
How to repair a hole leak in exhaust pipe without dismantling - YouTube. On the catback piping the welds have very minimal leakage a few pin holes here and there the major leak is on the downpipe flange off the turbo from what we can tell. TIG welding is ideal and built for welding thin metal sheets such as exhaust tubing. However you must take extra precaution to TIG weld your exhaust pipe.