The ultimate breather can kit for the C4 AAN S4/S6, everything needed for a clean, OEM type conversion.  Our Vortex breather can is neatly installed with custom molded, 4-ply reinforced silicone hoses to pull oil and water vapor out of the crank case breather fumes, this results in greatly reduced oil sludging in the intake system. 

Pooled oil in the intake tract reduced intercooler efficiency and reduces the fuel octane by allowing the motor to ingest oil.  Also keeps the oil where its supposed to be, in the sump, by automatically draining back to the oil pan.  Fully bolt in install, no modifications required.