K&N's work great, just don't over oil them. I've been running them for years on all my cars. No problem with the Touareg either in 10K miles.
Reviews of K&N parts For Business
USA
The only thing im using is a KN Drop-In Filter and that's it.
basically the dirtier a paper filter gets the less it flows...not true for K&N
the paper filter is better for maybe the first 500 miles, after that the K&N breathes better and does not lose its air flow/filtration over time
They're on the high end, though not the absolute best, in terms of the length of filter material/number of pleats. The construction quality is good - all metal and rubber, no cardboard. The cans are tough as hell.
I've been running K&N oil filters on my racecar for the better part of 4 years now - same engine, no rebuilds but I perform very regular maintenance. I regularly change the oil at the beginning of every season and proceed to thrash the crap out of my 1.8l 16v for about 1300 miles (most at or around the redline). I haven't had any ill effects due to low filtration, high pressure, low pressure, drain back, etc - all this on an engine that is six seasons old!!
I put one in the Passat a few months ago just for the sake of a better engineered product. It was a cold night for my turbocharged engine, so any greater power I felt I'm sure was imagined. Don't count on it. Just do it for a better quality filter that lasts longer.
I have had a K&N in my 1999 Passat for over 20,000 miles. No CEL's or any other problems. I didn't notice any siginificant performance gains, possibly a 1 mpg increase in gas mileage. To be safe, I haven't put a K&N in my 2001.
hp-2005 will not fit my car. discount auto parts sold that to me after looking in their "data bases". it was wrong though because when i got home and went to do the change, naw. im a 1995 if that helps you out at all. the hp-2005 isnt cartridge type like i/we need
One problem that you can have with the K&N over the stock air filter is over-oiling by novice users. If you over-oil it and the extra oil gets onto the mass air flow sensor, you will need to replace the sensor. Supposedly they aren't cheap either. K&N filters can also be a pain to take care of too. When they get dirty, you have to wash them and re-oil them. This adds another time to screw up.
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