Audi S4 Air Filter
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App: 2005-2009 Audi S4
Brand: K&N
Part #: 33-2209
Notes: K&N HIGH FLOW DIRECT FIT AIR FILTER, RED, SOLD INDIVIDUALLY -- 50-state legal; Provides 1 to 4 h.p. power gain; 96 to 99 percent filtration efficiency; 1.125 in. height, 10.313 in. outside length, 8.25 in. outside width; Oiled element; Panel style; Made of multiple interwoven layers of surgical cotton gauze; Increases horsepower and acceleration while providing excellent filtration; Custom designed to fit into existing air box and features a drop-in design which means adding performance is simple; Provides high air flow with excellent filtration; Economical and environment friendly; Works with OEM vehicle electronics; Will last the life of your vehicle; Washable and reusable; Lasts up to 50,000-mile before cleaning is required depending on drive condition; With K&N's limited million mile warranty.
Material: Cotton gauzeStyle: PanelType: Direct OE Replacement, High Flow OE ReplacementWarranty: K&N's limited million-mile warranty
| Make | Model | Year Range | Chassis/Engine |
| Audi | S4 | 2005 - 2008 | Avant; 8Cyl 4.2L; |
| Audi | S4 | 2005 - 2008 | Base; 8Cyl 4.2L; |
| Audi | S4 | 2005 - 2009 | Cabriolet; 8Cyl 4.2L; |
App: 2000-2002 Audi S4
Brand: K&N
Part #: 33-2125
Notes: K&N HIGH FLOW DIRECT FIT AIR FILTER, RED, SOLD INDIVIDUALLY -- 50-state legal; Provides 1 to 4 h.p. power gain; 96 to 99 percent filtration efficiency; 0.75 in. height, 9.875 in. outside length, 8.25 in. outside width; Oiled element; Panel style; Made of multiple interwoven layers of surgical cotton gauze; Increases horsepower and acceleration while providing excellent filtration; Custom designed to fit into existing air box and features a drop-in design which means adding performance is simple; Provides high air flow with excellent filtration; Economical and environment friendly; Works with OEM vehicle electronics; Will last the life of your vehicle; Washable and reusable; Lasts up to 50,000-mile before cleaning is required depending on drive condition; With K&N's limited million mile warranty.
Material: Cotton gauzeStyle: PanelType: Direct OE Replacement, High Flow OE ReplacementWarranty: K&N's limited million-mile warranty
| Make | Model | Year Range | Chassis/Engine |
| Audi | S4 | 2000 - 2002 | Base; 6Cyl 2.7L; |
| Audi | S4 | 2001 - 2002 | Avant; 6Cyl 2.7L; |
App: 1992-1994 Audi S4
Brand: K&N
Part #: 33-2029
Notes: K&N HIGH FLOW AIR FILTER, PANEL STYLE -- Height 1.125, Outside Length 12.063, Outside Width 7.125, A High Performance Air Filter Designed to Increase Horsepower and Acceleration, Offers High Air Flow With Excellent Filtration, Washable and Reusable, Fits Into The Existing Factory Air Box, With Manufacturer's Limited Million Mile Warranty
Material: Cotton gauzeStyle: PanelType: Direct OE Replacement, High Flow OE ReplacementWarranty: K&N's limited million-mile warranty
| Make | Model | Year Range | Chassis/Engine |
| Audi | S4 | 1992 - 1994 | Base; 5Cyl 2.2L; |
App: 2000-2001 Audi S4
Brand: K&N
Part #: RF-1014
Notes: K&N HIGH FLOW AIR FILTER, ROUND TAPERED -- OD 7.5, Flange Length 1, Flange ID 6, A High Performance Washable And Reusable Filter That Lasts Longer, Made With Ultra-Strong Molded Pliable Rubber Flanges Which Absorbs Vibration, Allows Secure Attachment And Can Be Stretched Up To 1/16" To Fit In-Between Sizes, With Manufacturer's Limited Million Mile Warranty
Type: Direct OE replacement
| Make | Model | Year Range | Chassis/Engine |
| Audi | S4 | 2000 - 2001 | Base; 6Cyl 2.7L; |
| Audi | S4 | 2001 | Avant; 6Cyl 2.7L; |
App: 2000-2002 Audi S4
Brand: Fram
Part #: CA8080
Notes: FRAM EXTRA LIFE AIR FILTER, FLEXIBLE PANEL -- 2.19" Height, 8.39" Width, 9.88" Length, Protects The Engine And Provides More Airflow For Improved Performance, Helps Prevent Damaging Particles From Entering The Engine And Causing Increased Engine Wear, Lasts 50% Longer And Stops 50% More Dirt Than Any Other Brand, The First Air Filter To Utilize Two Integral Filtering Elements, With Fram's Limited Warranty
Type: Direct OE replacement
| Make | Model | Year Range | Chassis/Engine |
| Audi | S4 | 2000 - 2002 | Base; 6Cyl 2.7L GAS, FI, Turbocharged, VIN "D", APB; |
| Audi | S4 | 2001 - 2002 | Avant; 6Cyl 2.7L GAS, FI, Turbocharged, VIN "D", APB; |
| 80 | 90 | 100 |
| 200 | 4000 | 4000CS |
| 4000S | 5000 | 5000CS |
| 5000S | A3 | A4 |
| A6 | A8 | Allroad |
| Cabriolet | Coupe | Fox |
| Q7 | RS4 | RS6 |
| S4 | S6 | S8 |
| Super 90 | TT | V8 |
| Marshall Engines | Iceman | Edge Products |
| Painless | Bushwacker | American Racing |