H&R 2.5 inch ID Single Race Spring Length 18 inch Rate 500 lbs/inch - R25180500 fits_2007-2008`Audi`RS4 Constructed from 2-1/2" - 3"

Constructed from 2-1/2" - 3" Mandrel-Bent Brushed Finished 304 Stainless Steel Tubing

The Mishimoto F1X M5/M6 Charge Pipes are a durable

Pre-Preg Dry Carbon Fiber Construction - Autoclave-cured for improved strength

Vehicle-specific upgrade kits

7L Cummins and features a tube and fin design optimal for heavy load towing and rapid load changes

H&R 2.5 inch ID Single Race Spring Length 18 inch Rate 500 lbs/inch - R25180500 fits_2007-2008`Audi`RS4 Constructed from 2-1/2" - 3"H&R 2. 50" I. D. Race Springs are made with extremely high tensile strength wire alloy which allows the use of a thinner wire. Manufactured using advanced materials and precision technology in Germany, H&R 2. 50" I. D. Race Springs are crafted from special lightweight (hf) 54SiCr6 spring steel. For any given spring rate, they are on average 15% lighter and have 10% more travel than competitors' springs. Main springs range from 6" to 18" in length and