This is a no fluff step by step video showing you exactly how a professional fabrication and welding shop repairs someone's mistake.
In this case, I tried to MIG weld a stainless EGT bung into a cast manifold using an old Harbor Freight flux core welder. It went 50 miles before cracking off. My Turbo Diesel Mercedes was down for the count after this until the guys at Fluid MotorUnion saved the day.
Huge thanks to Fluid MotorUnion in Naperville Illinois. If you need anything done to your car just give them a call at 630-305-3054 and mention LegitStreetCars.
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By Alex

17 thoughts on “Here’s how to tig weld an exhaust manifold and carnage of improper welding!”
  1. Avataaar/Circle Created with python_avatars Danny T says:

    Good job on the pulse setting.

  2. Avataaar/Circle Created with python_avatars Viktor Sz. says:

    Maybe the Welder use the silicone bronze filler rod, not normal stainless steel rod, maybe 309lsi filler is good for cast iron, but the gray cast iron will cracking of, So a stick with a high nickel content should be used

  3. Avataaar/Circle Created with python_avatars Tarzan Baby says:

    So if you were going to weld a cast steel turbo manifold with a stainless steel pipe.. so cast steel to stainless…would you use a higher nickel filler?

  4. Avataaar/Circle Created with python_avatars Dick Tomasko says:

    silica bronze would be easier.

  5. Avataaar/Circle Created with python_avatars Michael Szczys says:

    Should probably be titled “ welding new bung on my manifold”

  6. Avataaar/Circle Created with python_avatars tom thompson says:

    what did he charge you for that job?

  7. Avataaar/Circle Created with python_avatars Rick says:

    I need teepee for my…

  8. Avataaar/Circle Created with python_avatars TwentytenS4B8 says:

    Welding cast iron is tricky. Without access to a TIG welder ( And the necessary skill to operate it. ) you have to preheat the iron before attempting to weld it. MIG won't penetrate enough. Use a stick welder.

  9. Avataaar/Circle Created with python_avatars TheLassenman says:

    What was the weldingmaterial used to weld this stainless steel onto that castiron manifold? Was it 309?

  10. Avataaar/Circle Created with python_avatars AutoStar⭐️ says:

    I live near Naperville Illinois, i just bought a pretty nice e320 Mercedes for $1200 in Addison Illinois

  11. Avataaar/Circle Created with python_avatars Hola! Tyler Lynn says:

    @legitstreetcars What modifications do you recommend for reliability on the om648? Egr removal? Swirl Flap delete? I have to build a custom intake for my om648 to fit it in my Volvo C304 and I figured along with that I will delete the egr and swirl flaps. What are your thoughts? and how would I go about deleting them?

  12. Avataaar/Circle Created with python_avatars Kenneth James says:

    Ok I'll do it… points at Alex and goes ha ha!

  13. Avataaar/Circle Created with python_avatars Robert FromOC says:

    You should have stuck your camera inside a welding mask to film the weld part.

  14. Avataaar/Circle Created with python_avatars Bello Automotive says:

    I’ve welded my fair shake of cast manifolds even have a video of it on my channel, from I always pre heat the cast and what I’m welding to it also slow cool it after welding for a crack free weld. Since cast and stainless have different heating and cooling properties if this isint done it will usually result in a crack at the toe of the weld after a some heat cycles. I’ve seen it good without a pre and post heat but why chance it and it will last a lifetime if done correctly. Great content nonetheless

  15. Avataaar/Circle Created with python_avatars TheCrazySquirell says:

    That beard is fucking sinful.

  16. Avataaar/Circle Created with python_avatars Richard Smart says:

    For something that needs to be dependable you either need to be a decent welder or at least use a decent welder like an Everlast or something and not a harbor freight welder.

  17. Avataaar/Circle Created with python_avatars LegitStreetCars says:

    Follow me on Instagram to see the final pictures of the painted manifold and turbo. @legitstreetcars

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