Originally posted by Mongoose
Does it has an air pump? if not you need headers
STUPIDITY CAUSES CANCER
86-88 air pump is used for opening of 3rd and 4th port connected to ACV
89-91 air pump is used for opening of 5th and 6th port
for 86-88 when you get headers from lets say racing beat they give you a ACV (air control value) block off plate. but if you order it from say some company like pace setters you get jack shit.
for 89-91 you dont need a acv block off plate becuase your 5th and 6th port works off the air pump.