Expert Verdict (2026) - Why Buy?
The GROM AUDB3 is the go-to hands-free Bluetooth solution for owners of 1998-2010 Audi models — including A2, A3, A4, A6, A8, S4, S6, S8, and TT — who want wireless calling and music streaming without replacing their factory stereo. It plugs into the original CD-changer harness, keeps steering wheel controls fully functional, and includes the AUDS splitter cable needed on most Audi setups.
Quick facts: GROM-BT3-AUD · Compatible with select Audi A2, A3, A4, A6, A8, Allroad Quattro, RS4, S4, S6, S8, TT (1998–2010, non-MMI stereos) · Hands-free calling (HFP) and wireless audio streaming (A2DP) · Includes GROM-BT3 module, vehicle-specific harness, microphone, and manual · 1-year replacement warranty.
Add Bluetooth hands-free calling and wireless music streaming to your factory car stereo with the GROM-BT3 integrated Bluetooth adapter.
Compatible with: Select AUDI 1998-2010 factory stereos.
- Hands-free calling (HFP)
- Wireless music streaming (A2DP) from any smartphone
- Steering wheel and stereo control compatible
- Includes: GROM-BT3 module, vehicle-specific data harness, microphone, installation manual
AUX-In cable sold separately.
Vehicle Compatibility
| Model |
Years |
Notes |
| A2 |
1999–2005 |
— |
| A3 |
2003–2006 |
— |
| A3 |
2007–2009 |
No MMI, no SAT |
| A4 / A4 Quattro |
1998–2005 |
— |
| A4 / A4 Quattro |
2006–2008 |
No MMI |
| A6 / A6 Quattro |
2001–2004 |
— |
| A8 / A8 Quattro |
1999–2002 |
— |
| Allroad Quattro |
2001–2004 |
— |
| RS4 |
2007–2008 |
No MMI |
| S4 |
2000–2005 |
— |
| S4 |
2006–2008 |
No MMI |
| S6 |
2002–2003 |
— |
| S8 |
2001–2002 |
— |
| TT / TT Quattro |
2000–2008 |
No MMI |
Note: "MMI" refers to Audi's Multi Media Interface — vehicles with MMI-equipped stereos are not compatible with this kit.
