RB Turbo N54 Coolant line to Block interface fittings for custom turbo applications. These can be used for custom twin or single turbo configurations, using AN block off caps as applicable. They are CNC Machined out of T6061 and then anodized black. The fittings are - 6AN and each one comes with a new O-ring. You will want to use clean engine oil to help them into position during installation.

Note 1:

These offer no advantages to OEM/Hybrid turbos as they have already have working plumbing solutions available, and thus are primarily only for use with custom applications.

Note 2:

The upper front to block adapter and the coolant neck adapters are identical, the only odd adapter of the four is the rear upper block interface adapter.