CTS Turbo CTS-IT-290R intake for Audi A4/A5/S4/S5 B9 uses the factory fresh-air duct and routes airflow through a large 6" velocity-stack filter. The kit includes a heat shield, 3.5" silicone turbo inlet hose and installation hardware for MAF-less cars.

CTS lists expected peak gains of about 10-12 hp on a stock vehicle, with sharper turbo response and a more pronounced intake and diverter-valve sound under load. The kit is intended for 2.0T and 3.0T B9 applications; confirm that the specific vehicle does not use a MAF sensor before ordering.