The D while in the engine code stands for twin overhead camshaft (DOHC). This is often attained by fitting an RB25DE or RB26DETT cylinder head and or turbo to an ordinary RB30E/T block. The RB25DET just isn't usually used. Even though the Formal quoted energy of the RB26 was 276bhp, https://reidolrmu.blogminds.com/indicators-on-rb26-motor-for-sale-you-should-know-26022087