I have had K&Ns on my last 3 diesels and 2 gas engined cars and they all ran over 300,000km. There is absolutely no evidence of fouling of the MAF, but there was a noticeable increase in power and mileage on each car and the intake track is noticeably cleaner.
I have had a K&N in a TDI for over 300,000km. NO MAF problems.
As been the pattern with the 2.5 engine, if, you install and intake and get a CEL recheck all connections making sure the 2 smaller hoses are tightly fastened and without kinks. Make sure that the MAF is properly seated in its housing.
I personally haven't had any trouble with my K&N's
on my turbo it revs a little faster.
I dropped one in and got better gas mileage, noticable power increase (slight), and a badass sound.
I have run K&N's on all my cars as far back as I can remember. I'm waiting for spring when I can do a baseline comparision of HP before and after the K&N install with my GTECH Pro competition before I do the installation.
I ordered two of the K&N filters for my V8 T-Reg (hey, anything to improve mileage). I've installed these things on my previous car before and it was pretty cake.
My vr6 had nothing but maf issues after I installed a k&n. I wouldn't even dream of putting a k&n in my 1.8t. The paper filters are fine. It's been proven on the dyno more than once that you get no gains from a k&n whatsoever. Unless you think you are going to clean and reoil your k&n to reuse it and save on filter costs (in which case again you have to be careful not to over oil or you screw up your maf up big time) there is no specific benefit to gain by installing one. Let me note that I've not noticed the same issues in older vw's, just mk IV's.
I once took my maf housing out and it was really dirty... I had a K&N drop in BTW I think it flows better but it flows too much crap too.
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