Has anyone tried installing a powered subwoofer like the Infinity Basslink ?
My head unit (clarion DZX435) has adjustable subwoofer outputs and I
wouldn't have to install an additional amp. The space under the passenger
seat has a cd changer in it. :?:

I remember a post about someone that installed the BassLink. He had pretty good results. If you are going to use the speaker-level connection, be sure to tap into all 4 speakers, otherwise the bass will sound crappy (that is what I remembered from the post).