No "real"/ additional HP gains with HE. Look at it like this. You just ran someone down the street/strip and now you want to run him again or someone else. Your S/C and IAT's are spiking because of the work they just did. You may not notice it SOTP, but your car is now pulling timing/HP to compensate the temps. You could be taken the second time and loose face, lol. The upgraded HE would help the S/C to cool down and continue it monster crushing work. Hope that helps. So No gains, just keeps you consistant.