Have a 13 Wrx with 10k on it. Today i installed a K&N air intake on it and something isnt right. Off the line i dont notice any better response and power wise i would say its the same if not less than it had with the stock intake. Now aside from that when u get into it around half throttle or more at just over 4k just as its starting to push some power it goes flat. It hesitates. Best way to describe it would be like if you were to hit the rev limiter. Then after that quick skip or whatever it is, you can feel the boost kick back in. Now b4 i get responses about checking the fittings I'm a mechanic so i understand the basic trouble shooting and i have gone back through my work. Any ideas? I put some easy miles on it to see if the comp would adjust for the added air and its still running like sh*t.