I will be having the rotating assembly for my 85 12A clearanced and balanced and am thinking of having them lightened as well. The car will be NA for a while but is likely to be boosted in the future. I'm concerned with taking away the rotor's ability to absorb heat and also compromising its structure. I don't think it is absolutely necessary to lighten the rotors because I will already be using a 9 lb Turbo flywheel and aluminum main pulley, plus the most that the engine will see will be 8500-9000, less when boosted. It just may be worthwhile since I will be sending the rotors out anyway.

Opinions from people who have EXPERIENCE with boosting on lightened rotors is very appreciated.