Your choices for now are exhaust , air filter, and headers . You can get a filter other than the Nismo, and JBA makes headers for the Frontier but it hasn't been tried on the X. I think Gibson is the only one to come out with the cat back for the X. Banks makes one for the Frontier that may fit with modifications(X is shorter) or you could have one custom bent and put a Flowmaster or Magnaflow on it. No chips AFAIK.