Application Compatible for Audi A4 1.8L 1781CC 109Cu. In. l4 GAS DOHC 2009 Compatible for Audi A4 1.8L 1781CC l4 GAS DOHC 2002-2008 Compatible for Audi A4 2.0L 1984CC 121Cu. In. l4 GAS DOHC 2005-2009 Compatible for Audi A4 3.0L 2976CC V6 GAS DOHC 2002-2005 Compatible for Audi A4 3.2L 3123CC V6 GAS DOHC 2005-2008 Compatible for Audi A4 Quattro 1.8L 1781CC l4 GAS DOHC 2005-2005 Compatible for Audi A4 Quattro 2.0L 1984CC 121Cu. In. l4 GAS DOHC 2005-2009 Compatible for Audi A4 Quattro 3.0L 2976CC V6 GAS DOHC 2002-2006 Compatible for Audi A4 Quattro 3.2L 3123CC V6 GAS DOHC 2005-2009 Compatible for Audi S4 2.7L 2671CC V6 GAS DOHC 2002 OEMandPart Number21-5352,8E0145153,8E0145153D,3380,PSP1096,3384,8E0145153H, 8E0145153J, 8E0145155P, 8E0M145155PNote* Professional installation is highly recommended (No Instruction Included)* For any needs please contact us