Review on 🚀 K&N Cold Air Intake Kit: Enhance Performance, Boost Horsepower: 50-State Legal: Compatible with 2005 FORD (Focus)57-2559 by Chris Owens

The hardest part of this kit was disassembling the stock intake system. Even then, all that was required was access to the screws and other fasteners. The performance is excellent as expected. I like intake sounds and it definitely is. Disadvantage: My ECU code is too lean for bank 1. This is due to the incorrect size of the intake manifold where the Mass Air Flow (MAF) sensor is located. The MAF for my 2005 Ford Focus ZX4 is programmed to detect air in an intake manifold of a certain size. Because this tube is larger, the MAF cannot accurately read the air flowing through the tube.