The D while in the engine code means dual overhead camshaft (DOHC). That is accomplished by fitting an RB25DE or RB26DETT cylinder head and or turbo to a regular RB30E/T block. The RB25DET is not generally used. 2:one), for the gentle to moderately modified street turbo engine, making the conversion https://marcodqqzd.blogoscience.com/34280572/5-simple-techniques-for-rb26-engine-for-sale