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I see 2 good options here but I'm not sure how it works with the B15.
If you want to replace your radio, you can get one with a built in RCA aux input. You get a wire with RCA plugs on one end and a headphone jack on the other, and it will allow you to plug the player in through the back of the head unit.
You could also get a radio that has CD-R/MP3 playback to help out with your mp3 needs.
as for the FM modulator and SF120 (if there is a difference between the 2), an FM modulator has a positive feed (must be run to a switch so you can turn the modulator on and off). It has a grounding feed, 2 RCA input jacks, an input for the wire coming from the cars antenna, and an output wire that plugs into the FM antenna plug in the back of the radio. I really don't like FM modulators b/c they F*ck with the antenna signal and it's alot of wiring, you're better off finding a radio that already has RCA inputs for an auxilary source.
If you're getting buzzing from the modulator, it is a grounding problem. Make sure the negative wire and the case of the FM modulator are properly grounded and not touching the metal casing of the actual radio.
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