Im going to buy the 5/16 one but I want to know which would be best for where I live. I was thinking the Isothermal one but not sure. I live in kansas so we have cold winters and hot summers. It usually doesnt get below freezing during the days and I dont drive my car in the snow. For summer its usually always high 80s low 90s. So if I can get some input from you guys that would be great. Thanks! Btw I have a 5AT

you should invest in an mrev2 b4 anything else.

Sorry I should have mentioned that I drive a 5AT

oh ok. then just spend the extra and get the copper one, just install and for get about it, no worrying about the coolent control valve (ccv).

Yup, similar-ish weather here, i'd go or the copper too.