The D while in the engine code means dual overhead camshaft (DOHC). This can be achieved by fitting an RB25DE or RB26DETT cylinder head and or turbo to an ordinary RB30E/T block. The RB25DET isn't commonly used. The two Infiniti and Nissan have used the VH45DE engine. Nevertheless, the VH45DE https://rb26motorforsale93692.goabroadblog.com/27827857/a-review-of-new-rb26dett-for-sale