HP+ are meant for street and race. therefore, they will be a harsher material, thus more noise. And upon further research have the same coefficients of friction @ 200º and 600ºF as the ITR front pads (.45-.55).

I have a chart I made of some aftermarket pads and the EBC Greens have an operating temp of ~200-1200ºF, similar coeff. as the HP+; except have lower harshness on rotors, and a fairly low dusting. Greens' pad life is somewhere around 35K miles.