Review on K&N Universal Clamp-On Air Intake Filter: High Performance Premium, Washable, Replacement Filter, 4 In Flange Diameter, 5.5 In Filter Height, 1.125 In Flange Length: Round Tapered Filter, RG-1001BL by David Dugas

To be honest I knew it wouldn't have any real performance impact since it's not a cold shot. However, within 3 minutes I turned it on and the sounds my turbine was making were almost orgasmic. Don't think there will be more horsepower since the air intake is usually close to a hot engine, but since it costs less than 10x the cost of a true cold air intake. worth every penny. When it came to assembling my 2017 Audi A4 (B9) Quattro it was easy enough. It comes with three rubber mounting rings that will expand or contract to fit your own intake manifold. I've never written a review in the past so that's a good one to take.