Glad to know they're available. I'm a big fan of K&N, been using them since the 70's. Always found an increase in performance and gas mileage (usually about 10%). Stopped once I started leasing. I don't think you will see 10% on a modern car, but anything that makes it easier for an engine to function, will give a performance and mileage boost. If I keep the Energi when it needs a new filter, I will surely put one in. Very pleased with the Energi so far (2 months, 2,000 miles, 80 miles per gallon) Solid German feel. One of the best cars overall that I've owned (Fiat 128, BMW 2002tii, Mercedes 250, 2 Fords - Mystique (great) and Sable (garbage), and a lot of Passats and Golfs.
