I ordered a new sub for my car and need to know if the stock radio in it will be enough. its the stock radio on the 2015 st
I would not suggest using the stock radio for powering a sub. (Not sure if that is what you meant, but that is how it sounds from your writing)
You at a minimum need:
Subwoofer in an enclosure (all in one sub and amp will work)
Amp
Power Wiring (recommended from battery)
Signal wire ( for amp turn on or signal sensing amp)
Wire to tie into one of the speakers (recommended from front speakers)
Optional but recommended:
Line Out Converter (recommended Audio Control LC2i)
Base Control knob
Note:
There are many threads concerning this very subject that can help guide you through this process...
Best of luck