So I removed my silencer and the other thing from under my car  on my exhaust.  I went around the corner from the shop and the engine fuse blew.  It blew another, theres no exhaust leaks and the 02 sensor was put back in the exhaust.  Would pulling out the "other" part of my car have to do with this?

i had the same problem with blowing the engine fuse after installing my cat back, turns out the wires on the o2 sensor got pinched.