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hm headers

  1. GUS009

    [General] How To Fit HM 4 into 1 headers 5.7l/6.0l

    On the weekend i fitted a set of 4 into 1 from HM Headers and with very little experience and had great success taking me a total of 4 hours including removing a broken manifold bolt :). These are the fitting instructions for HM120SS/HM121SS short 4 into 1s with a few tips I leant along the way...