I've got a K&N panel in my stock `05 airbox, but I keep wondering if one of the K&N universal cone filters might not fit in there and give more filter area, thus less restriction.
http://www.knfilters.com/universal/universal.htm

Has anyone tried this?

 

I was looking at it. you need to add a sleeve to the inside of the top of the air box.

you also really would need to cut out the top of the box to make any of the filters fit properly.

 

I'm not so sure.

K&N offers several filters that have an offset/angled engine-side hole. My thought is that a simple angled short piece of PVC pipe attached to the inside of the upper hole could allow itting a cone or straight cylinder filter in there.

I'll measure the box and the engine-side hole position next time I have the panel out for cleaning, and see if it could match up with a larger-area filter.

 

jcw kit uses a cone inside the box, correct?
if so, then it is do-able. efficiency gains?

dan

PS OLDRICK -- beautiful work on the m7 scoop and intercooler set up!

 

Yes, but the JCW box is a completely diferent box all together, it shares nothing in common but outside dimensions.

 

If it's the same dimensions, then a cone or cylinder filter should fit and offer larger filter area. Worth taking some measurements, at least.

MINIBEEL - thanks - I'm planning to rework the experimental lower diverter flexible seal this weekend. Next version will be removable and much prettier...
6^)

 

PVC is fairly thick and will provide some restriction. a 2 1/2 or 2 3/4 piece of exhaust pipe might work better?

I was trying to find a fit, but dropped the idea. If you find one please let us know!
John

 

This is almost exactly the setup I have. I fit an AFE cone filter in the stock box. Used a PVC elbow to connect it to the hole in the top of the box leading to the TB. I cut open the back of the box and firewall where they meet, but the filter fit without doing that. The PVC piece angles the filter down, so it fits in the box. The only fiddling necessary was narrowing the end of the PVC that sticks into the hole in the airbox lid-easily done with just a bit of sandpaper. I'll get some pics if anyone's interested.

If anyone figures out a K&N that'll fit in this setup, I'd be interested to know. They have so many sizes/options, I figure I could fit an even larger filter in there!

 

i'm interested!
i'd love to see some pics if it is not too much hassle for you.

 

My thought was to use superglue to glue the flat end of a piece of pipe slightly larger than the hole to the flat surface surrounding the hole, and avoid restriction there.

How large was the cone filter? From the diameter of the ends and the length, you could calculate how much more area than a flat panel?

 

Cool, I'll take pics tonight!

I'll measure the filter. I can't remember the size off hand.

Would superglue work with PVC, and heat? After I fitted (aka "jammed") the thinned down PVC into the airbox hole, I ran a bead of silicon glue around the edge. It was pretty solid with just a friction fit, but i wanted to ensure no unfiltered air leaked into the connection.

 

Superglue will bond PVC stronger than the plastic itself, and the heat isn't a problem up to the temp that the PVC can take. Just sand the end down to a flat surface, and the glue should have plenty of area to hold it. That also gives you a chance to change the angle a bit if you wish.

Looking forward to the pictures. I really like the idea of getting a bit better flow with a completely stealth airbox. It could even pass the usual casual CARB inspection.

This would also allow one to adapt a K&N to the JCW intake, and get some real airflow improvement from it, which is my eventual goal.

 

I can appreciate all of the creativity but has anyone just tried the ITG replacement filters? I hear they are great.

 

IMHO, and in the results of many tests, foam filters simply do not filter nearly as well as the K&N design.

K&N isn't as good at blocking the finest particles as the stock paper filter, but is much less restrictive. Life is a series of tradeoffs, but I just don't "believe in" foam filter elements.

 

I thought this might be an alternative for ya - but its foam. Oh, well.