Just got my Lethal Performance gen 2 kit in the mail and was wondering - does it help with overall cooling at all? Has anyone noticed any difference with it installed? And more importantly, has anyone still had a cobra head go bad with one installed? I just had my terminator in the shop getting the heads redone - all of the valve guides were loose and #6 cylinder had a bad exhaust valve. Hoping this kit will keep that from happening again.