We used this in conjunction with water wetter and a higher pressure cap to help remedy some cooling issues observed on the 2011 NISMO we did. He had a road trip to Texas in which he didn't have a significant over heating issue, but he did say the temp gauge was a few dots above normal in slow traffic after have a little fun with the GReddy kit. Just those basic mods rectified everything.
Haven't had the chance to see how the heat works yet though!
Thanks,
Alex Goodwin
AlexG@motionlabtuning.com