Replacing the cat and exhaust manifold is easy to do. Finding them in Cali might be a little difficult. Here on the east coast, they are easy to come by. I have a couple of TR7 cats next to the garage waiting to go to the recycler and a complete manifold and converter still on a car I'm parting out. Going rate for a cat is around $75 at the scrap metal places, but that depends on the amount of material inside, type, year, make, etc. I'd also venture to guess that the air pump and injection pipes are missing, and maybe even all of the charcoal canisters. Car seems to be a good buy for anybody in the other 49 states, but could be a money pit nightmare in Cali.