Can you retrofit DSP Stereo?? yes you can, but it's a lot of $$$ and time, and I think you can have much better audio output with and aftermarket head unit and amplifier. For the retrofit you will need this: - DSP harness (the one that connect your head unit with your 3 plug amp) - OEM DSP amp - The ebay radio head unit that came with the DSP buttons - I think the new door audio harness - I think new HIFI speakers.... I did this upgrade in my car, my car came with only 4 speakers and NO rear amp, so I update my stock audio system for the NAV unit and M5 Audio System (M speakers the yellow/black ones, rear subwoofer, DSP amp) and it's a big improve, I really enjoy my M5 audio system, but this took me a lot of $ (around + $1,500), and I use a lot ebay used parts...... -------------------------- "SSS" <istrinti_@gmail.com> wrote in message news:idt2bm$3rc$1@trimpas.omnitel.net... tai cia ale galeciau i e39 isideti toki reikala? kokia kaina?