I have a 1994.5 f250
the only mod is the aftermarket round down pipe and no cadalic converter
I removed my stock air filter and housing and adapted the big round Wix filter
Is there any advantage to the wix or should I go back to the stock
The stock system does have a K&N that I can clean and not have the cost of the wix
thanks Jim

 

if you mean the 6637 filter, that thing is so big you might not have to replace it for a looong time. not to mention the stock box tends to allow unfiltered air into the turbo if its not put together absolutely perfect. stick with the 6637

 

Thanks for the reply

it is the 6637 filter

 

Definitely stick with the 6637 filter over the k&n or stock filter.

 

Yep, stick with the 6637. Much better filtration and better flow.

 

6637 is king!