Anyone here, besides ncmountainman run Evans' NPG coolant? I noticed that their website shows three different versions: NPG, NPG+, and NPG-R. I couldn't find anything on their site about the NPG-R stuff though. nc, any concerns about corrorison damage? Their site talks about sealing off the system, because it'll absorb moisture from the atmosphere. What happens if the system pulls fluid from the overflow back into the radiator? Isn't the overflow vented, to allow room for the boilover to flow back there? With no corrision additives, I'd think it'd be a concern, but if I knew, I wouldn't be here, asking questions. I've had one boil over on my wr450 - it was 90 outside, and it was slow, technical stuff. Right now, its 95 outside, and its supposed to be close to that all week. So, that prompted me to do some coolant research. I'm skeptical of stuff that you add to your oil to keep the bike cooler - I'd rather leave that job to the radiator, and let oil do what oil does - lube the engine. What about stuff like engine-ice, and water-wetter? Any experience with those products? Also, does anyone have those carbon-fiber air-intake-shroud-thingies installed? http://www.rockymountainmc.com/Product_Details.atv?pid=00085162 Do those make a difference? Thanks for the info! M.