Quote:
Originally posted by RPM427
the air pump pumps exhaust gas from the tubes on the back of your heads down into a valve, then into a tube right before your cats on the h-pipe. The egr valve diverts exhuast gas through the intake (holley intakes have an external passage) and into the intake tract behind the throttle body. This suposedly helps (only in idle or part throttle condtions) to completley burn the air/fuel mixture, thus reducing emmisions and reducing detonation.
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Yeah, see, at least I got the theory right. 
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1988 5.0 notch: Previously never modified!!
SN95 block front and rear seats, Mac catback, BBK off-road H-pipe, Steeda castor camber plates, Steeda lowering springs, Tokico shocks/struts, Alpine/MBQuart/PPI audio mods...
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