Ok first of all, What is it that you don't like about the pick-ups that are currently in your SG? Secondly, what type of music do you play?
Active pick-ups are battery operated and have a hotter signal than normal passive pick-ups. IMO, upgrading to actives can make a huge improvement in the tone of a bass guitar, but tend to be a pretty big waste of money for a six string.
My reccomendation for a distortion pedal never changes: The Big Muff by Electro-Harmonix. Buy one. It's all you need.
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