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Edelbrock's Hedman weld-together dyno headers are a particularly clean installation with the EGT probes under the 1¾-inch primary tubes. Edelbrock uses this same set of sprint-car style headers on all their Ford small-block dyno mules. The straight, symmetrical primary pipes are probably worth a pony or two over more tightly packaged in-car headers. The narrowband oxygen sensor is included with the XT manifold kit.