2002 - 2003 - 2004 - 2005 - 2006 BMW 320i - 325i - 330i - 525i - 530i - 540i - M3 - M5 - X5. Audio High Power Amplifier. Part Number: 65.128383871. Code Not Required. Radio Not Included. Free shipping to all 50 states! 90 Day Warranty! Free Live Tech Support! This is for a BMW Audio High Power Amplifier. This amp has been cleaned, upgraded, serviced as needed and thoroughly checked. Appearance is decent with minor scratches, and wear as pictured, function is perfect! This unit is being sold as a REPLACEMENT ONLY! The part number for this amp is 65.128383871. If you do not have this exact part number currently in your vehicle, it will likely NOT WORK. If you are unsure of your part number, give us a call with your VIN and we should be able to provide you with the correct part number. They may look the same and have the same plugs but data streams may be different, not allowing them to code. For example, external amps are used in some cars and will not allow interchange, etc.