The D in the engine code stands for twin overhead camshaft (DOHC). This can be attained by fitting an RB25DE or RB26DETT cylinder head and or turbo to a typical RB30E/T block. The RB25DET will not be usually used. The first alternative is sticking with the individual throttle bodies. This https://trentonxyyvs.blogdemls.com/28024586/not-known-details-about-nissan-skyline-rb26