Basslink is ok... I had one for about 6 months. It will do the job. Not sure if Bavarian Autosport's solution is a true plug n play. If you want to save some cash, grab a new basslink on
ebay for about $170 and then a $20 trip to Radio Shack. Check out the article
Wiring a sub amp for step by step wiring directions.
Here is my current setup