Post by
cheez80 »
https://forums.nicoclub.com/cheez80-u7841.html
Sat Dec 25, 2004 8:10 pm
if you're running no cat, you'll have fireballs (which may or may not be a good thing, depending on whom you want to impress, or how anal police are in your area)
reason being, an atmos bov will release air that has already been metered by your mafs. for example, if the mafs records 100 units of air, and your atmospheric bov releases 80 units of air, only 20 units of air will reach the throttle body, causing the car to run rich.
it's usually a good idea to recirculate on a mafs setup.
i went from atmos to recirc and noticed a big increase in driveability and response.