GARRETT GVB-50A, Vent To Atmosphere (VTA) Blow-Off Valve (BOV) 

GARRETT VENT | BLOW OFF VALVES ARE OUTLINE AND FLANGE COMPATIBLE WITH, BUT IS DESIGNED TO OUTFLOW OTHER BLOW OFF VALVES 
Direct Replacement for these other Blow-Off Valves: TiAl 50mm/Tial Q, Turbosmart, Precision 

Garrett Vent | Blow-Off Valves release excess boost pressure from the charge pipe when the throttle is closed, preventing damage to the turbocharger and other engine components, ensuring smooth operation and prolonging the turbo’s lifespan.