My stereo needs a little more boom and a bit more loudy. I dont wanna put a third party hu in, and I wanna keep it all looking standard. Also I dont really want to spend much on it.
Can it be done?
In a word, no.
Theres an outside chance your HU will have pre-outs, in which case you can get a small sub or something, otherwise its new speakers time - which aint gonna be cheap if you want some decent bass, not to mention the work of removing trim to get at the speakers