The air pump is used to keep the cats at a good operating temp (to warm them up when you start your car, they work better the hotter they get). If you have no cats (offroad pipe), you don't need it.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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