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The K&N's for whatever reason don't have enough filtration for the forced induction engines and tend to cause turbo "dusting". I don't know how much of the stock filter gets thrown away with a K&N kit, but it's definitely worth it to get the stocker parts back, especially down in Texas. Something about that white dirt just gets into every nook and cranny.
I have a K&N FIPK II that I bought back in the day.. It made no measurable performance difference at the track, and it's been sitting in the box for years now..They don't do as good a job at filtering out the very small particles which will lead to compressor wheel and piston ring wear.. I'm doing fine with the stock set-up..
Where could i find one for cheap? Im sure ebay has them, but i have only bought one thing off of there. I always like to actually talk to people and buy things that way.
Watch Craigslist.org.
You could even post an advert offering a free swap with anyone who has a stock Donaldson.
Sorry i have been gone for a coupe of days and havent had a chance to make it to my buddys shop to check on the codes, but........... The next day when i went out to the truck, the light was off and hasnt come on since?? I am completely stumped!
Oh, and i am going to have to check out craigslist! That might be some helpful info for you gurus!