H&R 17-20 Audi A4 Premium/A4 Premium Plus/A4 Prestige (2WD) B9 Sport Spring Fuel Delivery>Fuel Injector Sets - 5Cyl Another key element is the

Another key element is the tuned "Helmholtz" resonator which eliminates engine drone while maintaining a throaty sound

these high-quality steel bearings are an ideal choice when rebuilding your axle

Limited lifetime warranty

7L Hemi engine allowed us to custom tune an exhaust system which is almost 30 lbs

The Pro DRY S performance air filter features 3-layers of progressively finer porosity synthetic media that does not require oil providing maximum convenience

H&R 17-20 Audi A4 Premium/A4 Premium Plus/A4 Prestige (2WD) B9 Sport Spring Fuel Delivery>Fuel Injector Sets - 5Cyl Another key element is theSport Spring kits are H&R's number one selling product. Enhance the look of your vehicle with a reduced fender well gap. H&R'sport Springs lower the vehicle's center of gravity and reduce body roll for better handling. The progressive spring rate design provides superb ride quality and comfort. A lower wind resistance signature will make the vehicle more streamlined and improve gas mileage. If you are only looking to improve one part of your vehicle's