thats what i've been told?? by the manufacturers of these plenums eg subzero, micks metalcraft and mr enforcer..... they don't have the features to accomodate climate controll etc.. cauz they also use larger throttle bodies aswell which arn't nissan, some manufacturers jus say these plenums are for race applications y would u want climate controllwith a car that modified, i don't know bout the greddy plenum though??