K&N Air filter

[ash012882]

Is the K&N filter that fits stock intake bad for the 7.3L Motors. I have a 2001 Excursion with a 7.3

[timmyboy76]

jury's out on that one...i'd say yes.

[Wildfire532FB]

Why is a K&N bad?

[dieselcrawler]

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...

[Wildfire532FB]

Oh I was more concerned with the filter itself. I have a nice cone K&N that replaced the stock.

[chrispaine]

K&N is for the track, to provide the lots of air. its not made for off road or even daily on road use, they don't filter fine particles out and will "dust" your motor in the right (or wrong ha) conditions.

[Turbostang500]

Originally Posted by chrispaine

K&N is for the track, to provide the lots of air. its not made for off road or even daily on road use, they don't filter fine particles out and will "dust" your motor in the right (or wrong ha) conditions.

X2. This is exactly the way I see it. Also to add to it, a diesel does not regulate air consumption. This means the filter will likely have to filter 4x more air than the same driving in a gas engine. This much more air just means the maintenance would have to be the same amount more.

6637 gets my vote and is what is on my truck.

[Silver200273L]

Just go with 6637 filter. Best mod I ever done it.

[AgTires4295]

Originally Posted by Wildfire532FB

Why is a K&N bad?

Read my thread. Unbiased, real-life experience: The Truth About K&N Intakes

[chrispaine]

I put the Ford AIS in a few years ago, no regrets but it does cost a few bucks. I have yet the change the filter, the filterminder hasn't shown restriction but I might replace is soon just because. I should have got the weight of it new, I guess they can put of a few pounds of dirt!