Go to a K&N, they do work, contrary to what a lot of people say. They are for real and a good investment, I started in 94 with my first K&N in my wife Audi 100S wagaon, today the car is still running great with 95k+ miles. Just had a tuneup and I had the mechanic install Bosch plus 4's, the original plugs were nice and clean also the car never had a MAS failure.