May 10, 200620 yr the Nismo one, or the Billion one. Follow the link for info on the Billion. Look halfway down the page. Seems to have an advantage over the Nismo due to the high flow valve. However, it's also around double the price. http://www.splparts.com/Parts/Z32/Engine/Cooling/default.asp Nismo also makes an upgraded radiator cap. Some Z guys have had problems with this, and have gone back to the stock radiator cap. Z
were do i get a up grade radiator cap and how much and therm o stat