Aprilia RSV4/Tuono V4 Graves Smog Block Off Plates
Graves Motorsports Smog Block Off Plates 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). The air induction system (AIS) burns unburned exhaust gases by injecting fresh air (secondary air) into the exhaust port, reducing the emission of hydrocarbons. Sold as 2 plates and 1 rubber cap. Ftment: 2019-2023 Aprilia RSV4 1100/Factory 2016-2020 Aprilia RSV4 RR 2016-2018...