I have been using K & N products for many years on different car models. The result is the same - the fuel consumption decreases, the dynamics increase, the engine is much more stable. The only drawback is that the service takes enough time. The effect of filters on a motorcycle is especially noticeable - it breaks into a rocket. Lost service time immediately becomes indifferent. I love these filters very much and recommend it to everyone - it is worth every cent paid.
These are trusted aftermarket air filters. Just insure you place the supplied sticker in a prominent position so at the next service the filter is not replaced with an original filter. About to get one for the T5.