I’m fixing up a 96 ford diesel and going to keep the stock cassette player in it to keep the original look. The pics attached are the same type of radio. I found a video where shows how to solder a auxiliary cord to it for a iPod. I was wondering is there a way to improve the sound without changing it out. I figured can upgrade the speakers but is there a way to hook a small amp to the radio or is there something out there that attaches too the wiring to improve the sound?