I replaced my FM Modulator with a PA15-TOY interface awhile back. 1000% better plus full steering wheel controls!
I will give away the FM Modulator that was installed to whoever wants it. Just maybey send me $5 for shipping. It worked fine when I took it out, as fine as fine could be. It is not crystal clear but not horrible. If you cannot afford the $120-$150 for the PA15, & have the time & know how, it's yours. I do not have the instructions, but it is an Audiovox FM Stereo Modulator #132-5672 89.1/88.7 MHz. I removed it from my dash & think I got everything out. The only thin I kept that I think you may need is a 6' male L/R X male stereocord ($4 at Radioshack).