Automotive Parts and Accessories: Koni (82 2516Sport) Front Sport Shock for Audi S4 - Koni

Automotive Parts and Accessories: Sylvania 921 ST SilverStar High Performance Halogen Miniature Lamp, (Pack of 2) - Osram Sylvania

Automotive Parts and Accessories: Wagner ThermoQuiet MX340A Semi-Metallic Disc Pad Set, Rear - Wagner

Automotive Parts and Accessories: Standard Motor Products TC424 Trailer Connector - Standard Ignition

Car Audio or Theater: MTX Audio 500C4 Coustic Car Amplifier - Mitek Corporation

Automotive Parts and Accessories: {Factory Direct Sale} One Pair Front Windscreen Windshield Wiper Blade For Audi 2001-2008 Models Audi-A4-B6-1.8T Audi-S4B Audi-RS4-B7 Audi-A6-C5-2.7T Audi-S4-B6 Audi-A4-B7-2.0T Oem Plastic+Rubber Black - fds

Automotive Parts and Accessories: Allen Sports Deluxe 2-Bike Trunk Mount Rack - Allen

Automotive Parts and Accessories: Putco 240921R-360 Red 921 Plasma LED Bulb - Putco

Wireless: ReadyPlug? USB Data Charging Cable for BlueAnt S4 In-Car Bluetooth Speakerphone - Computer USB Charger Cord (3 feet) - Cable Forge

Automotive Parts and Accessories: AnzoUSA 121318 Black Clear R8 LED Style Projector Headlight for Audi A4/S4/RS4 - (Sold in Pairs) - AnzoUSA

Automotive Parts and Accessories: Hopkins 47275 Brake Control Installation Kit - Hopkins Towing Solution

Automotive Parts and Accessories: Putco 243157R-360 Red 3157 Plasma LED Bulb - Putco

Car Audio or Theater: MTX Audio 250C2 Coustic Car Amplifier - Mitek Corporation

Automotive Parts and Accessories: EiKO 9003/H4CVXL-BP ClearVision XL Halogen Headlamp, (Pack of 1) - EiKO

Automotive Parts and Accessories: Sylvania 2825 Miniature Lamp, Pack of 2 - Sylvania

Automotive Parts and Accessories: Rev Motoring Audi A4 A3 S4 B6 B7 Snub Mount Performance Duro - Rev Motoring

Automotive Parts and Accessories: EiKO 9003/H4PVP2 PowerVision Pro Halogen Headlamp, (Pack of 2) - EiKO

Automotive Parts and Accessories: Champion RC12YC Spark Plug, Pack of 1 - Champion

GPS or Navigation System: BOSS Audio MR202 Chaos Epic 200-watts Full Range Class A/B 2 Channel 2-8 Ohm Stable Amplifier - Boss Audio Systems, Inc.

Automotive Parts and Accessories: Centric Parts 104.03400 Rear Brake Pad - Centric Parts

The above is "Audi S4 Performance Upgrades - 2004 Audi S4 Performance Parts - Audi S4 Performance Parts" recommended related products, Please click on the picture to see product details and audi s4 performance parts reviews!