Banks Rep.....Just called me in ref to my e-mail for air filters.... for my year F250...
Basically I told him alot of people were on a forum talking threads about the Drop-in K&N air Filter and the dirt being pulled in. Told me they never had a problem with customers. Found that hard to believe over the info here on SDD.com Then he went on to tell me that 197k is not a great deal of miles on a 97 F250. Also that year has a very good design for the stock air box. He advised me that it would be Ok to change-out the airfilter w/out doing the exhaust, for now. But to really look in to the turbo down pipe being replaced because of its restrictive flattened design.....
The previous owner did open up the plastic extension that attaches foward of the filter box, with a dremel.
He must be new. The stock air box on the 94-97' trucks are known to fail. There was a recall on the lid back in the late 90's as they were letting in dirt. There are many other filter systems out there that are much better than the K&N. Most guys with the OBS trucks go with the Tymar system or a do-it-yourself system that replicates the Tymar. AFE is another good choice. You can check out the AFE at dieselsite.com. There is a write-up in the wiki about the diy system. You can see the Tymar intake by clicking here. If you are set on the K&N then go with it, some guys like them but you are not going to convince most of us that they are worth a dime. They let more dirt through than any other filter on the market but they do let lots of air through too.Also that year has a very good design for the stock air box.
again... on the track. We're not talking 200-300 thousand miles here.K&N makes the #1 aftermarket ATV airfilter out side of Saturn. How do we know ... real /uesers/ riders/ out on the mx track or GNCC(cross-country) racing!
BTW Note : K&N makes the #1 aftermarket ATV airfilter out side of Saturn.