Hi Don. I bought their exhaust kit which included the crossover, then to a single exhaust with the muffler. The kit was the "commando" exhaust, but, at the time, they were not able to provide the resonator.....I found a "near new" resonator on ebay. At the time, the resonator was unavailable from their supplier. I remember the sound from my Dart Charger back in the early 70's...nothing else sounds like that exhaust system. Amazing what you have done with that California car. Sgrip65.