my amp is 50 rms x 4 @ 4 ohm and i have Rockford fosgate T165s which is 80 rms, is it work upgrading my amp and what rms should i upgrade to and would i even be able to tell a diff in 30 rms watts? thank you.
I can't tell you there would not be an audible difference, but you have a good amp now. If your music collection has been hand picked for excellent dynamic range, which most people don't do, then maybe you would hear a difference if you doubled or tripled the power. That extra power is for transient peaks. Pop music has no peaks, it's all loud, so the extra power would go to waste.
Are you only using that amp to run one set of components (Rockford fosgate T165s)? If so, why don't you bridge the amp and you will get 150 rms x2 and you can keep the gains down. The extra distotion from bridgng will not be audible at all