We don't know why Nissan chose plastic for the Y-fitting for the OEM Intercoolers on the Q50/Q60 and the new Z, the plastic is prone to breaking or even fusing to the hoses it's inside. We have a solution that should never break, or leak again, a full billet aluminum fitting with black anodized coating just like what should have come from the factory. These fittings are bit more expensive compared to the rest of our offerings but they had to be machined on a 5-axis mill due to their complex shape that mimics all of the OEM angles and is still of comparable price to the OEM plastic unit.