Audi S4 mods and performance parts
809 parts for the B9 Audi S4 (3.0T V6), grouped by what you are changing. Each page lists the options by brand and part number and links to the retailer for price and fitment.
Fitment: Listings are read from the retailer's B9 S4 (3.0T, quattro) category. Confirm engine, drivetrain and model year on the retailer page before ordering.
Exhaust
Audi S4 exhaust systems →
41 parts from 13 brands. Cat-back and axle-back systems, mufflers, tips and valve controllers. A cat-back replaces the exhaust from the catalytic converter rearward. An axle-back replaces only the rear section.
Audi S4 downpipes →
12 parts from 8 brands. The downpipe joins the turbocharger outlet to the rest of the exhaust. Aftermarket versions are sold with a high-flow catalytic converter or without one.
Audi S4 exhaust tips →
53 parts from 4 brands. Clamp-on and weld-on exhaust tips. Most are universal parts sized by inlet and outlet diameter, not made for one car.
Engine
Audi S4 intakes →
39 parts from 12 brands. Replacement intake systems, airboxes and filters.
Audi S4 charge pipes →
9 parts from 5 brands. Replacement pipes for the pressurised intake tract between the turbocharger, intercooler and throttle body.
Audi S4 tunes & engine software →
36 parts from 12 brands. Engine and transmission software, flash tuners, piggyback modules and throttle controllers.
Audi S4 intercoolers & charge cooling →
11 parts from 8 brands. Intercoolers, heat exchangers and related charge-cooling parts.
Audi S4 turbochargers & turbo parts →
25 parts from 13 brands. Turbochargers, turbo kits, inlets and related hoses.
Audi S4 fuel & ignition →
31 parts from 14 brands. Fuel pumps, injectors, flex-fuel kits, ignition coils and spark plugs.
Audi S4 cooling upgrades →
3 parts from 3 brands. Radiators, oil coolers, expansion tanks and hoses sold as upgrades.
Audi S4 engine & mounts →
30 parts from 10 brands. Engine and transmission mounts, catch cans, pulleys and internal engine parts.
Audi S4 drivetrain →
4 parts from 3 brands. Axles, driveshafts, differentials and limited-slip units.
Suspension
Audi S4 coilovers →
32 parts from 9 brands. Height-adjustable spring and damper assemblies.
Audi S4 lowering springs →
21 parts from 13 brands. Shorter springs that lower ride height on the factory or aftermarket dampers.
Audi S4 suspension & chassis →
90 parts from 24 brands. Sway bars, control arms, bushings, strut braces, dampers and alignment parts.
Brakes
Wheels
Exterior
Audi S4 front lips & splitters →
12 parts from 3 brands. Front lips and splitters that attach to the lower edge of the front bumper.
Audi S4 spoilers & wings →
6 parts from 3 brands. Trunk spoilers, roof spoilers and wings.
Audi S4 rear diffusers →
4 parts from 3 brands. Rear diffusers and rear bumper trim.
Audi S4 exterior & aero →
35 parts from 5 brands. Grilles, mirror caps, side skirts, emblems and other exterior parts.
