There are multiple ways that can help you in improving RAM 1500 performance levels. You can get a new cold air intake and enhances more airflow in engine and get more economy, you can get a good tuner and tune you Ram 1500 as per your performance needs or you can install a better exhaust system also.
Apart from that getting a throttle response controller, throttle body spacers, turbo chargers or superchargers also gives you a option to boost performance level of RAM 1500.