I guess there's a difference in the exhaust temperature and the pipe itself.
I have saw 1,300 ET at the end of a
4 sec 0-60 run and nothing is red hot .

 

Yes and there is a difference in the material the pipe is made from as to the temperature it glows at and color seen. Also note that laminated pipe can be red hot on the initial layer and less than 600 degrees on the subsequent layer

Titanium, aluminum, magnesium and zinc = never emits light even at melting point
Cast iron, steel, tin and tungsten
752 -- Red heat, visible in the dark
885 -- Red heat, visible in the twilight
975 -- Red heat, visible in the daylight
1077 - Red heat, visible in the sunlight
1292 - Dark red
1472 - Dull cherry-red
1652 - Cherry-red
1832 - Bright cherry-red
2012 - Orange-red

The length of time it takes to glow depends on the thickness and surface area.

Old motorcycles commonly had glowing head pipes at 3000 rpm and the chrome would turn blue or yellow. Honda introduced double wall head pipes and the chrome would not turn color, but sometimes the inner pipe would rattle against the outer pipe resulting in consumer complaints. In rare occasions the inner pipe would deform or collapse causing loss of power above idle.

 

I'm on the RZR forum and they are guys always complaining about red hot Turbo and the other guys telling them it normal.

For me I can't put it under load long enough for anything to get very hot.