Use this adapter to make your installation of a subwoofer bass amplifier to the factory system faster with a cleaner install. Use this plug and play adapter so you don't have to cut or splice into the factory wiring. Provides rca output and a power wire for the remote amplifier turn on connection. Adjustable gain output. Very important- Test the 12v accessory ignition wire- Most VW around 2008 and newer might not have an accessory power wire in the harness so the amp turn on wire of this adapter won't work- please cap it off. Compatible Vehicles: BMW: 2002-2006 3 Series (Nav vehicles only or with flat pin connector), 2001-2003 5 Series, 2004 - 2010 BMW X3, 2000-2006 X5, 2003-2008 Z4; Mini: 2002-2008 Mini Cooper (2005-2008 Convertible only); Pontiac: 2008-2009 G8; VW: 2012-2015 Beetle, 2009-2014 CC, 2007-2011 EOS, 2003-2014 Golf/GTI, 2003-2015 Made for Jetta, 2003-2015 Passat, 2006-2009 Rabbit, 2004-2010 Touareg/Touareg 2, 2009-2015 Tiguan