2005 Audi S4 Base Performance Parts

Adjustable High Flow Fuel Pressure Regulator with 1 to 1 boost reference

The Precision Raceworks AN6 Male Check Valve is the ultimate solution to ensure optimal fuel system performance. Designed to prevent fuel from draining from your lines, this check valve is the perfect addition to your high-performance fuel system. Constructed from premium billet aluminum, featuring...

Transform the rear of your Audi B9 A4 or S4 with this GTX Carbon Fiber Trunk Spoiler and be sure to turn heads along the road. Installation is a breeze only requiring 3M double sided tape and is 100% reversible if you choose to remove the spoiler. This spoiler is...

Are you looking to improve the head on and side profile appearance of your Audi B9 A4/A5 S4/S5? RW Carbon has you covered with these beautifully constructed carbon fiber mirror replacements. Coming with or without a lane assist option, these are not the typical mirror covers, but...

Are you looking to upgrade rear end of your Audi B9 A4 or S4? RW Carbon has just what you want with this carbon fiber trunk spoiler. Within minutes it will completely transform your Audi A4 or S4. Installation is a breeze, only requiring...

Tired of the front end of your Audi B9 A4 or S4 looking stock and boring? RW Carbon has your solution with this carbon fiber front lip spoiler. There are no modifications required to get it installed and only requires some 3M tape and self-tapping screws. This...

Audi B8 / B8.5 S4 & S5 Valved Exhaust System T304 Stainless Steel, High-Pitch X-Pipe, Vacuum Valve Control Overview Transform your supercharged V6 into a true auditory experience.Our Valvetronic Designs Valved Exhaust System for the Audi B8 and B8.5 S4/S5 delivers a unique, high-pitch...

DBA's 4000 Series XS rotors feature our best technology & materials for maximum performance. High carbon & heat treated iron, patented Kangaroo Paw ventilation and a unique drill & slot pattern makes the perfect direct replacement rotor.This Part Fits: Year Make Model Submodel 2004-2008...

No matter what you drive, or how you drive it controlled stopping power, in all conditions is necessary. Brembo brake kits come with everything you need. Prime Ceramic Brake Pads minimize noise and vibration for maximum driving comfort. Also, reduced friction wear and low...

Restore lost toe adjustment due to frozen or broken adjusters on Audi A4 and S4 models with this replacement toe adjuster cam kit. The kit features a hex chromate free 700 hour salt spray tested finish and is sold per wheel. Order two kits...

Adjust front camber and caster +-1.5deg on the Audi B5/B6/B7 and C5 platforms with these forged aluminum adjustable control arms from SPC. OE style booted ball joints and bonded rubber bushings maintain factory ride, handling and noise, vibration, & harshness (NVH) parameters. Audi's unique...

Adjust front camber and caster +-1.5deg on the Audi B5/B6/B7 and C5 platforms with these forged aluminum adjustable control arms from SPC. OE style booted ball joints and bonded rubber bushings maintain factory ride, handling and noise, vibration, and harshness (NVH) parameters. Audi's unique...

If you want the best, this is it. The NX Stage 1 EFI nitrous system is the top of the line EFI power booster on the market. From the highest flowing solenoids, to our patented Shark nozzle, this system screams nothing but quality. NX...

If you want the best, this is it. The NX Stage 1 EFI nitrous system is the top of the line EFI power booster on the market. From the highest flowing solenoids, to our patented Shark nozzle, this system screams nothing but quality. NX...

If you want the best, this is it. The NX Stage 1 EFI nitrous system is the top of the line EFI power booster on the market. From the highest flowing solenoids, to our patented Shark nozzle, this system screams nothing but quality. NX...