If you drive your B9/B9.5 S4/S5 on track or hard on backroads, or simply during daily commutes in hot climates, the 034Motorsport Auxiliary Side Mount Radiator Upgrade Kit is the perfect upgrade to help regulate and maintain optimal engine coolant temperature. While high-performance driving can push your engine to higher coolant temperatures, doing so with added power can generate excessive heat that the factory side-mounted radiator can struggle to dissipate. This can lead to elevated coolant temperatures, reducing the effectiveness of your vehicle’s cooling system and potentially impacting performance.The Auxiliary Side Mount Radiator Upgrade Kit is designed to replace your factory side mount radiator with the larger and more efficient CSF Radiator. This upgrade increases cooling capacity and enhances the reliability of your cooling system. Whether you’re looking to tackle backroad and track adventures or live in a higher-temperature climate, this upgraded side mount radiator provides the cooling performance you need to keep your engine running at its best, lap after lap, mile after mile, regardless of the ambient temperature!The Auxiliary Side Mount Radiator Upgrade Kit is designed specifically as an upgrade for vehicles equipped with the OE auxiliary radiator, ensuring compatibility and seamless integration with your vehicle’s existing cooling system. Before purchasing, please inspect your vehicle to see if it is equipped with the factory driver-side auxiliary radiator. You can do this by opening your hood and visually identifying this factory auxiliary radiator that lives in the front driver-side fender well underneath your headlight. If you do not have the factory driver-side auxiliary radiator, you can easily retrofit the necessary mounting provisions and hoses to install the Auxiliary Side Mount Radiator Upgrade Kit utilizing the OEM components listed below. 034Motorsport Engineers extensively tested the Auxiliary Side Mount Radiator Upgrade Kit on 034Motorsport's Development B9 S4s on backroads and at multiple racetracks and found it to greatly improve the cooling capacity over the factory auxiliary side mount radiator. FEATURES Increased Cooling Capacity Utilizes CSF #8132 Radiator Precision Bent Stainless Steel Mounting Bracket Retains OE Air Duct CNC Machined Billet Aluminum Adapters to Retain OE Shrouding Crucial Upgrade to Keep Coolant Temperatures in Check on Tracks, Drag Strips, Back Roads, or Higher-Temperature Environments What's Included: CSF #8132 Radiator Removable Metal Rock Guard x2) Billet Aluminum Adapters x1) Stainless Steel Mounting Bracket OE Part Interchange: 8W0 121 218 Retrofit Components: This is a list of components needed to retrofit the 034Motorsport Auxiliary Side Mount Radiator Upgrade Kit. This list is specifically for vehicles that are not equipped with the factory driver’s side auxiliary radiator. 8W0 122 101 AM - Coolant Inlet Hose w/ Divorced Fitting 8W0 122 049 A - Aux Cooler to Inlet Fitting N 906 870 01 - Spring Band Clamp 8W0 122 055 Q - Coolant Outlet Hose w/ Divorced Fitting 8W0 121 471 B - Aux Cooler to Coolant Hardline 8W1 121 070 - Coolant Hardline to Outlet Fitting N 906 870 01 - Spring Band Clamp N 906 869 02 - Spring Band Clamp (x2) 4D0 317 867 A - Rubber Bushing for Rad Bracket (x3) 8W0 121 333 A - Air Guide for Aux Radiator N 911 335 01 - M6x1.25x18mm Flanged Hex Bolt (x1) Or Generic M6x1.25 Bolt N 911 893 02 - M6x1.25 Flanged Nut (x3) Or Generic M6x1.25 Nuts N 902 259 01 - Retaining Washer for Rubber Grommet (x2) Or Generic M5x15 Washer N 107 214 01 - M6x16 Screw to Secure Coolant Hardline (x2)