i need some help real bad please post on this

Last week was the first time I've rode my rzr at night and I noticed that my head pipe is glowing real bad about 8-10" of it I have a full hmf exhaust system with a k&n filter is this normal for the glowing I order a new pc5 and have it on it now its map for a full muzzy exhaust and the same filter I have but I'm still getting the glowing please help if you can