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The headers were never shipped in the trunk. That is just a car magazine perpetuated myth. They were over-the-counter parts that you had to purchase at the dealer parts department. The only time they came in the trunk was when you bought them at the parts counter and took them home.
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To make it clear, the above statement is incorrect. See my above post. Headers and or cowl plenums could be ordered with the car. If I remember correctly the base z28-1 in 67 was $358 and the z28-4 was $800+, this was because headers and cowl plenum were included as delivered in the car.Of course you could also order them from the parts counter after the fact. What Kim's post stated was that 60% of the 67 z28were in fact ordered as z28-2's. I am not sure of the percentage, but know they could be ordered as an RPO. BTW, Charley was actually correct.