Chuk: Do you have the johnson cm30 ic pump or the bosch? I still have the stock cooling system with the updated bosch, but I just recently added the 65mm pulley, dcai, and ec tune. The cooling is fine in virginia now with it being winter and all, but I was expecting that I was gonna have to add the bigger HE and iso kit in the summer. This past summer with a completely stock srt6 i felt a little power loss when the temps hit 90 plus. Does the iso kit really improve the cooling to a significant degree? I don't track the car fyi, but she does get a street workout every now and then.