Smog Block Off Plate Benefits
Posted by Shane McCoy on Jan 22nd 2020
Graves Motorsports Smog Block Off Plates are designed to seal off the ports on the valve cover used by the air injection system (a.k.a smog pumps or AIS). These products are intended for closed course competition use only. Use of this product for any other purpose is strictly prohibited.What is the AIS or Smog System? The air induction system (AIS) burns unburned exhaust gases by injecting fresh air (secondary air) into the exhaust port
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