Stack Fuel Injection air filter "Booties " made by Hilborn in the USA. Designed to slip over certain Stacks made by Hilborn : 

Read below, if your stack is odd shaped or has a tab flipped up these will have to be modified to work ;

Air Filter Booties for Ram Tubes

Will fit from a 2-1/2" outside flare to a 3-3/4" with D shape or round, can be stretched over 3-7/8"   but tight .......

WASHABLE

Fine  industrial mesh material seals out most dirt and dust.

Not meant to be a high particulate filter for high mileage driving.
 

  Sold as Set of 8 on E Bay

No Return if you modify them or damage them or stretch them too far and break the elastic