go custom, i had random tech and damaged it in an accident, i replaced the cat itself with a catco from summit ($80) and a muffler shop welded it to my pipe and installed it for another 80, it may be a little more since youll need flanges and piping made shouldn't be more than 200 total, only downside is the piping may not be stainless but still you cant beat that price, and it's the same thing.