RE: BROKEN MANIFOLD
that header was either laser or ultrasonicly welded, mac's uses straight acetylene torch heat for headers such as they sell, from your pictures. MJD, i see two things, the silicone connector is hitting the wing, and your pipe clamp wasnt isolated, we usually slip a silicone hose over the stinger then use a standoff, i prefer suspending pipe by its midsection or largest diameter, the weston header has quality control issues, as the seam/bead junction is porous from over heating during weld....and the result is extreme brittleness, i have broken some mac's headers, only by violent impacts with this planet[>:][:@] that header end where it meets the pipe has seen some serious fretting and impact, you busting perma frost???with it?[8D]