i just bought a k&n intake for my 4.7 liter durango, when i took off the factory intake there is a small rubber line that goes into the filter along with the large intake hose. the k&n filter doesnt have a spot for the small line to plug into. is it ok to just leave that small line uncovered?

 

My guess would be no, but I dont hav an aftermarket kit

 

Get a breather filter to fit that line...

 

John,post us back if you see any gas mileage improvement with air system=I was lookin to just replace the kilter with a k&n and I'm wondering if the entire system is worth the price oe just replacing the filter and keeping the old box is more cost effective. Ty

 

I take it the line comes directly from the valve cover. If so make sure to put a filter as Neo had suggested.

 

i have seen an improvement in gas mileage over the last couple tanks, but idk if its fair to say the intake is responsible because i just changed my spark plugs as well, but between that and the intake, i went from 16-17 on the highway to 19-21

 

Pretty much most performance addons are also better for fuel mpg as long as your gentle on the foot. Although not huge improvements on mpg, it does help a lil (pretty much same with exhaust)

 

3Mpg gain? that seems to be a little much for a CAI install, Your plugs must of been really shot.

 

the plugs were pretty bad, and i replaced one of the ignition coils as well, idk if it was bad, but it was really discolored compared to the others

 

I agree with that....

You need to connect the lube. Filter it if it comes out of the valve cover.

Most people take those intakes back after reading whats in this thread.
Do It Yourself (top questions and answers)

For a CIA do whats in there. Basiclly a drop in K&N filter in the OEM air box and a custom ram air CIA.