i am about to buy a Garrett T4 turbo and wanted to know will it fit, the turbo is a 60 trim. also i want to know if i am gonna need to upgrade the oil pressure regulator if i install this turbo or will the current oil pressure be ok. i already have 4 x 660 cc injectors coupled with a 255lph walbro fuel pump and S-AFC

 

You will need a new turbo manifold. It won't fit the stock unit. You don't need to upgrade the oil pressure regulator. You don't have enough fuel; you will need bigger secondaries. 60 trim what? 60 trim to4E??

 

well if i upgrade the secondaries to 800 then use 550 primaries will that be ok or should i go bigger like 880??

 

That will probably work for up to 12psi.