Ross Sport -4 AN 0.9mm Restrictor Fitting
These are designed to be run with all Garret GT28, 30 & 35R Ball Bearing Turbos.
Spec as per recommended by Garrett for ball bearing turbos only!
Thread: 7/16" x 24 tpi (M11 x 1.00mm) to -4 AN 0.9mm Restrictor Adapter