I find that some people have the wrong concept of modding.
If you have a pedal you don't like, don't mod it. You probably don't like the inherent tone to begin with.
If you have a pedal you like but it seems to be lacking a bit on gain/bass/mids/treble, that may be a candidate for modding. BUT - only mod with the right amp and guitar equipment in mind. DON'T mod gain pedals based on the idea that the gain pedals will sound the same with different amp and guitar equipment. They typically don't.
If you haven't settled on a playing technique, don't mod. Your playing makes a difference to your tone.