The D during the engine code means dual overhead camshaft (DOHC). This is certainly accomplished by fitting an RB25DE or RB26DETT cylinder head and or turbo to a typical RB30E/T block. The RB25DET just isn't commonly used. HKS has also developed a different camshaft posture sensor using a flush anodized https://rb26motor93688.onesmablog.com/not-known-details-about-rb26-engine-sale-68614488