Customers with a Stock Turbo
The Garrett GTP38R turbine housing can be used to upgrade your stock 0.84 A/R housing to a 1.00 A/R housing. The 1.00 A/R will reduce back pressure lowering EGT's.
Customers with a Garrett GTP38R
The Garrett GTP38R turbo comes with a 1.0 A/R turbine housing. Use the 0.84 A/R housing for quicker boost at low engine speeds, or the 1.15 A/R turbine housing for higher horsepower engines used at higher engine RPM's.