...I had an exhaust leak after installing a mac prochamber to my stock manifolds on the drivers side ball and socket between the manifold to midpipe connection, used the sleeve provided by mac but also used part #31357 from NAPA which allowed more thread space to tighten down the midpipe to the manifold, exhaust leak gone. Just thought I would post to help anyone else going through what I was going through without any really good solution. Hope this helps.
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