Well had it been that my experience with the K&N Free flow filters was good i would have been the first person to get this on my linea. i am a huge fan of free flow filters at its the most basic and cheapest mod with good gains. you car revvs freely and you feel the difference immediately. But when it comes to indian conditions these filters prove fatal to the engine and other components. i bought the K&N as it has lifetime warranty, cleaning needs to be done only after 40-50k kms and much more claims. Day1 when i fitted the K&N filter that too replacement ones which is the safest bet i felt an immediate increase in performance. i was very happy crunching miles on it, then one fine day my car started giving idling trouble and much more. checked every damn thing but the problem was not solved. then i opened the throttle body, also dismantled all the sensors on it. I was shocked to see the goo sort oil fudged dirt all over in throttle body. the IAC valve was almost stuck. the MAF sensor fully coated with sticky oil. i cleaned it throughly which was very difficult and somehow aligned all the sensors to correct voltage etc with Maruti ECU TECH2 scanner. then my car was again happy but this happiness was short lived. after clocking few thousand kms again same problem. again cleaned the throttle body. then i switched to oem filter and did 15k kms without any problem. but again the kida of performance filter struck me and again i put the k&N but this time after getting a new brand replacement after complaining K&N about my problem. after few thousand kms again i had to open the throttle body and this time the IAC was damged. i had to replace the whole throttle body which costs almost 16k INR but i got it out from an brand new accident loss vehicle so costed me just 3000 rs. now i am seeing that the inlet ports are clogged with black dirt and oil, the valves cover when opened shows similar scene inside and i dont even know whats up with my pistons. the compression has definitely become low. i am still using the same filter though which i tend to throw out as soon as i am back to india. but to be frank the performance free flow filters are very good mod to anyones car. its just the climatic conditions in india that screw up their claims. i know one rule more free flow = less filtration. and before anyone blasts me that i am defaming the free flow filters let me share the pics of my ride in US which is modded with free flow filter and intake revision. but intake revision is not a plastic. you can see that the filter remains clean despite of thousands and thousands of kms clogged on them.