Last week I did some surffing on NPG coolant, if I remember correctly it said it could lower your temp's 30%, but the regular NPG required possibly changing some components. But there is a new line called NPG+ that is more user friendly. I searched through several site's that discussed the new NPG+ coolant then I came across a site that said it was not electric pump friendly, so I quit looking at the product. But if you want to look yourself, here's a link. I myself may look into it again to see why it's not electric pump friendly.
http://www.evanscooling.com/html/npgPls.htm

Here's the site that said that it could not be used with electric pumps.
http://www.thunderracing.com/catalog...id=610&pcid=82
[EDIT] After posting this I called thunderracing to ask why the NPG+ could not be used with electric pumps. They said that the product was thicker than antifreeze/water, almost like a light oil and was to thick for most electric pumps to move it.