The Wagner Tuning Audi B5 S4 Intercooler Kit is a high performance redesign of the factory side mount intercoolers designed specifically for tuned and modified B5 S4s. Wagner's engineers have increased the intercooler core size drastically, and improved the end tank design to remove any OEM bottlenecks, resulting in increased flow rate and charge cooling properties. Constructed with the highest quality bar and plate intercooler cores combined with cast aluminum and then CNC end tanks for reliable high performance air to air charge cooling. OEM+ fit and finish for easy installation.