The O.D. on the lowes stuff is like 4.5 plastic. The thing is I have 2 really nice K&N's one that im putting on is huge. plus I have all the other silicone stuff laying around to use a rigid elbow and one of my filters. We all know how expensive these filters are and that pipe would probably save me 50 bucks on the total. I just want to use the crap i have laying around and buy a aluminum 90

 

well then how about the rubber elbow and a short piece of 4" pipe to conect the filter to the elbow. you just but the two and up and cant even see the pipe. thats what i have done on some projects.

 

here is a pic of what i am talking about. there is a section of 4" tubing between the filter and elbow but you cant see it.

 

That's how Im doing mine when it gets above 40deg out. Im also going to run one crankase breather into the metal section, to get a little vaccume. Hopefully it dosen't pull much oil.

 

not meaning to high jack, but parish is that the vette radiator over flow you are using? is so that is the same one I will be using.
Now on to the regular schedual programing,
Mark

 

It sure looks like the overflow that was in my Vette.

 

Did you look at airflowonline.com yet??????