Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
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there is a ton of threads on this... do a search and read what you find... in general, from what I've read, the drop in K&N filter that fits in the stock air box doesn't fit well, combined with the fact that the stock air box bail clips tend to break and not seal the filter in well enough, lets dirty air get past the filter, and dust the turbo/engine.
Personally, I think the Wix 6637 filter/DIY intake is the best filter for the dollars... takes about 15 minutes to remove the stock air box, and install the 6637 filter with adaptor pipe (which is nothing more than a 4 to 7" long pc of 4" OD exhaust pipe and a hose clamp) and offers great CFM's of air flow, over 2x, almost 3 times stock CFM. This is the first mod I'd do...
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