No this is no joke...Have you ever wondered why even a $100,000 cars do not fit K & N as standard ?Have you ever heard of a top end Ferrari or Merc or Porsche using K & N or any air filter design like K & N. F1 cars are all about packing as much performance as possible at less weight and space. They also strip down or junk engines which cannot give best performance. None use
K N. Getting more air alone into the engine is not the criteria. THE AIR MUST BE CLEAN OF DUST. That's why we call them AIR FILTERS. Hold a new K N to a strong light and see ...you will see tiny holes through the cotton fibers.


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. I did a lot of digging and got answers. I posted regarding your query because K&N is not good for our Motors and WE END UP PAYING A LOT OF MONEY FOR A NO GOOD FILTER 
Did you click on his signature by any chance.... He wasnt talking about a bone stock RTR...

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