no to 1, just need new mounts. im not sure if you can use the immobilizer, but you will need kpro. hasport has released a header for k swapped cars, dtr or you can mod a tsx header. if you have a exhaust on it, it must be shortened wether use a cat or not, even shorter for use of a cat. dont use your stock civic piping though. you can just buy a short ram for a civic and it should work aslong as its short and straight. the other ?'s i cant help you with. chime in...