The Kurenai are a faction of Broken draenei in Outland. This is an Alliance-only faction, so Horde, try looking at the corresponding Horde-only faction, the Mag'har. This Kurenai Reputation Guide will tell you how to get to exalted the fastest way. Why do you want to get exalted with these? Look at the rewards from their Quartermaster, Trader Narasu. Mainly people want the Talbuk mount, their Tabard, or the part of the Diplomat Achievement to get exalted with them to get the title " the Diplomat" (You need to get exalted with Timbermaw Hold and Sporeggar too for this Achievement).