well if your ignition timing is off itll blue the pipes. if your carbs are off itll blue your pipes. even some bikes with stock tuning will do it, severity depending generally how long the pipe runs straight from the port, if its bent right at the port it happens easily.
wanna know the real way? not blue be gone bs but, getting a proper tune on the engine, and ceramic coating the inside of the pipe. and, that will only reduce the effects, stainless blues with heat, PERIOD. keep the heat away and it wont do that
now you know why alot of bikes run dual wall pipe. the inner carries the heat and the outer has the "bling" but is protected from heat.