are you guys talking about the frame fitted coolers or the other type, wouldn't mind putting one on my bike but not 100% convinced ,

I run the Jagg oil cooler on mine. (Low Mount with the auto thermostat. 180F) My bike rarely ever gets over 200F on the dip stick. Even on hot days. That and the KP Filter have made a heap of difference in Temps. This is the temp at the Oil dip stick. It won't affect head temps one bit though. The only pain is oil changes. Due to the pipes running under the filter, oil gets everywhere so it can be messy...