if a IFX-14 and a TY-147 barely fit (160mm) and a Mugen Max wouldn't fit at all (161mm) a Ashura (161mm) would not fit either.
according to corsair the max is 150 according to reviews a pass Noctua NH-U12S pass (158) so i have in choice the Mugen 4 (not 2 ... )
funny that's exactly what's hinder me in my Carbide Spec 01 150mm for a Aircooler and single 120mm single thickness rad max , yet i still think i could fit a Seidon 240 without removing the HDD cage like the reviews state. (but the RAM would be touching the rad even if they are LP
)
my G.Skills ARES 2133 who where LP with a HS where barely hot on touch : 2133 could work without HS in a good ventilated case.
well those where CL11 so if yours are CL7 maybe they need one ... bot are they needed? (CL7-9 i mean xD i didn't see a huge improvement between a CL11 and a CL9)