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Yasuni, which one ?

C16 is a good pipe for the due+ cyinder though it can be driven with the whole Yasuni range. It only depends on your oil qualty and how much rew you would like.
 
I would go for the c16, it performs way better than the R on the due+, i've seen many due+ setups with R's, c16, and other pipes, so far the best I've seen was with the c16.