Brad I agree with you on the OE call in temps, but that was for the EPA's benefit. Funny thing my 08 Cobalt never gets higher that 218*, ( and it's motor is 1/2 of an LT5 ), and normally it's right around 200*...of course it has more EPA junk hooked up to it than you can shake a stick at! What a mess under the hood!
Luis, not everything is snake oil....now if you asked about the T/B airfoil...
...I'll try anything that will help lubricate the w/p, even if it don't reduce the temps.
Jim, yes, I agree you need to have a clean cooling stack to start with or it's just a band aid. I pulled my rad at yr two & cleaned up the stack and have had the intake screen on since the car came off of the truck. The screen works, you should see the junk it collects!
Tom