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...
'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD
'00 F350 extcab, 9' utility bed, dually 228k
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E'99 F250 extcab, S/Bed 211k. Sidelined due to motor issues.
'00 Excursion Limited, 7.3PSD 294k
'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k