I would like to upgrade the dash speakers in my car. It's stored for winter. So I can't look at it to see. Can I pop off dash speaker grills to change speakers? Or does dash pad need to come off? Are Delco speakers 4 0r 8 ohm? Any way to add a small amp to the factory radio? I have a new in box trunk mount 5 cd changer. It feeds into stock radio thru factory antenna port. So I would like a tad more power to the front speakers. I find rear speakers are useless with top down. So no upgrades planned for rear speakers. I've found with fader set to full front speakers is what works best with the top down. I'd just like to pump up the front sound a bit. I want the whole deal to be total stock appearing. Just sound a tad better. What's possible? Pic of the radio in question.