These type of low restriction air intake kits are useless on a turbocharged engine as the boost provided by the turbo is not affected by these type of intake filters. On a normally aspirated engine, they may have some minimal advantages by slightly decreasing pumping losses within the engine. Also, the oil used on the air filter can contaminate your Mass Airflow Sensor. I would recommend staying away from these. Use the stock system.
The major problem I see with any of the aftermarket filters is oil contamination of the MAF and dirt injestion due to porosity. Just hold one up to the sun and look at the amount of light that comes through compared to the stocker.
The way I've read it over here is the only thing worth doing is maybe a panel filter but only if you're getting the car re mapped otherwise they're a waste of time apparently and that was from a tuning specialist.
VW TDI forum, Audi, Porsche, and Chevy Cruze Diesel forum
A forum community dedicated to Audi, Volkswagen, Porsche, and all turbo diesel owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, TDI, maintenance, and more!