CTS Turbo 3" Open Air Intake Induction Kit 6" Velocity Stack For Audi RS6 RS7 S6 S7 C7/4G. At CTS Turbo we are proud to announce our Audi C7 S6/S7/RS6/RS7 4.0L V8 velocity stack air intake system. Air then flows through our high flow cone air filter, which utilizes an inverted cone design for maximum engine breathing.
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