Welcome to DF! I escaped california 40 years ago and have only driven quickly through it to get to somewhere else a couple of times since then. I don't know if there are any good ways to improve performance, dependability and efficiency without violating the emissions requirements other than to buy a non-emissions LB7 that's grandfathered into the state. Do you know if the truck already has any deletes or anything from the previous owner? Hopefully others can offer advice??