8) if you are referring to part number h6601 01, they are good headers, as hooker header have been around for a long time. that said however, the headers that are available from classicinlines are much less expensive than the hookers for mustangs unlimited, and are a more modern design. personally i would go with the classicinlines headers.
Lets get some dyno #'s or track times.
The hookers bolster mid-range torque with the long primaries & a 1 1/2 " diameter primary.
All the others are short tubes & are 1 5/8" primaries. ????????
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