I just bought a Certified Pre-Owned 2006 3.0 non dsp with nav and i want to add some bass. A friend recommended the Infinity Bassslink. He also told me about an install kit available on ebay. Has anyone ever used the Basslink? If so do I need the kit? Also i have a sirius sportster from my Lincoln Navigator that i want to put in my X5 will it work? Do i need an fm modulator?? Thanks for any advice this is the greatest site ever!!!