I just got a Hot Rails which I believe is for the neck position (says SHR-1N on the back, though the guy I bought it from said it was a Mid position pickup). I was thinking of putting it in the bridge of my MIM strat to try it out, because the stock pickups are pretty low output. Would I get a higher gain and better harmonic response from installing it in the bridge position?
no, it will be like installing a weak bridge pickup, since its rails you have no pole-distance issues. probably wont sound bad though.