you could just drop it off right at the cat ... but back pressure is one of the biggest problems in exhaust .. you'll lose some power ... but thats normally if its a I4 like mine ... and catback exhaust isn't too good for a I4 either
thats just the fuse panel ... it could just be an old wire that is shortin out somewhere .. if you have a ohmeter then you could just test all the wires .. a lot of work but it could be
well if you havent figured it out yet .. you can try puttin a breaker bar on the nut then restin the breaker bar on the frame and bumpin the motor over a couple times to break it loose .. its not a reverse thread .. its just on there real good
i think bagged splash is right .. i got a ranger with a 3/4 drop on it and the left rear sits a little lower than the right ... i never noticed it til i dropped it ... everything is in fine condition that i can see visually .. but you cant see when the shocks are bad .. you can only feel it