These are injectors boss adapters for 1JZ and 2JZ engines. You will need these adapters to convert your OEM side-feed setup to a top feed upgraded setup.

Most aftermarket fuel rails will need these boss adapters to allow a top feed injector to sit properly on the inlet manifold.

Our boss adapters are made of 6061-T6 aerospace aluminum. They feature a viton o-ring to seal against the intake manifold ports and do not require you to weld them as opposed to other manufecturers offerings.

* Price is for a pack of 6 *

* Please note : our own billet fuel rails already include these adapters for free. If you buy a fuel rail from us there is not need to purchase this item *