The 40mm Port Anti-Lag valve , introduced in 2021, is based on the successful 30-34mm ALS valve originally designed in 2011 and has been on race winning cars in Rally Championships and RallyX.

Air from the plenum or compressor (depending on the plumbing used on your engine) is fed into the primaries through a 40.00mm (1.574”) single outlet port.

An alternative to the single port outlet is a 4 port outlet, where air is fed into the primaries through 4 tubes with a bore of 15.80mm (0.622”).

Cold air is fed into the ALS through a Wiggins fitting (Dash 28) with a bore of 42.90 (1.688”).