What is the amount that you are looking to spend? Having the components installed without a suitable amp, you wont be able to extract the best out the installed components due to the headunit provided by Fiat. No doubt the components will sound better at lower volumes, but definitely at higher volumes the quality is going to deteriorate. If I may suggest, you can EVO in Cambridge layout. You need not buy from him, just mention your budget and he will suggest the suitable speakers based on what kind of music you hear. Then you can as well source and install it from any other place that you are comfortable with. I have been a customer to this store from post a few years and he has not disappointed me on the audio front with the budget I was ready to spend.