not from what i have used, both ports are the same size and provide the same amount of oil flow, and both are sufficient enough to supply the turbo, there are arguments however that the stock oil pressure is too high to be ran straight to the turbo itself, some use a a pressure reducer because its easier on the center cartridge of the turbo, but ive never had a problem neither has anyone else i know whos ran turbo with oil supply straight from the block.