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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
most aftermarket headers have a bunghole (hehe) already in them if it's needed for O2 sensors. Headers are usually called a "bolt on" part, though they can be a bit more than that due to rusting on the old manifolds.
its real simple first u have to remove the old ones and then put the the new ones on in the exact same place with new gaskets and torque them down to the specified weight then a few days later do it again. remount ur exhaust or have new exhausts ran its real easy ....j