This is likely because the plastic valves typically found in OEM setups would not be capable of handling the A45's 26PSI of boost without failing prematurely

PCD: 4x100/114

It combines the responsiveness and  of a recirculating valve

The Gen-V WG45 Hyper-Gate45 external wastegate is a cost effective

you can expect a broader boost & torque curve through peak boost being achieved earlier in the RPM and being held longer

Straight 1.00" x 60mm Blue" Wastegate This is likely because theHigh performance multi layered Silicone hose. Constant temp resistant from 50 to 170 degrees Celsius ( 60 to 340 degrees Fahrenheit) and pressure rated to 220PSI with a 5mm wall thickness. Engineered to Win by Turbosmart.