its a good weigth reduction, idk how much exactly it all adds up too, condensor, compressor, the dryer, all the lines, thers alot under the dash like the blower motor and the air ducts or ssomething, like the doors that control where the a/c blows, but if u daily ur car and take it to events n stuff, id keep all the a/c components, i recently got my a/c working and converted to r135a, but if u do drive ur car on the streets, and it rains? ud like to have the heater ready or else ull be a rolling fog machine