RacingLine Cold Air Intake System – 8J Audi TT 2.0 FSIOne of our most popular products is the Cold Air Intake System kit, enabling cold, dense air from outside the engine bay to reach the fuel metering unit more efficiently for 2. 0 TFSI turbo engines in Golf 5 GTI K03 models. Our High Flow TriFoam triple layer construction is simply the best filtration material on the market, and is the key to the power gains achieved. Each filter is handmade in the UK. Some people forget that its whats inside an intake