DIY cold air box
Thread Starter
Joined: Mar 2008
Posts: 8,718
Likes: 6
From: San Diego, CA
It was for a civic or integra I think. But it really doesn't matter since it just needs to be 3" and have a 45* bend. I cut it shorter, chopped the existing tube off the side, tapped it for the NPT fitting, drilled a hole and had a piece of aluminum welded on for the BOV. It's all completely custom, so don't expect to find it pre-made on ebay.
does this look like the right intake pipe? thanks again for all the help
http://cgi.ebay.com/ebaymotors/1998-...item27a8c14ad5
http://cgi.ebay.com/ebaymotors/1998-...item27a8c14ad5
and my hoodprop fits fine. also left the stock snorkel and plumbed the end into the side of the box.
Last edited by datz; Sep 9, 2010 at 02:45 PM.
Thread Starter
Joined: Mar 2008
Posts: 8,718
Likes: 6
From: San Diego, CA
I like the idea of keeping the stock snorkel. I had a concept box I made a few years ago where I ducted the snorkel to it, but ended up tossing the cone filter since the car was still NA and the box allowed lots of hot air in too. I was going to try it with this box, but knew it would be hard to get the lid high enough for the snorkel, yet low enough to clear the hood. Did you make a lid, or just skip that and fit the shape to seal against the hood?
Thread Starter
Joined: Mar 2008
Posts: 8,718
Likes: 6
From: San Diego, CA
Sure it'd work for an S5. You just don't need to drill the 4 holes in the back side of the box for AFM mounting. A hole just big enough for the inlet is all you would need.
So, here they are finally. It actually took me a long time to get these right. It's been years since I used AutoCAD, so I had to relearn it, haha. Sorry about the widescreen format. I run 1600 x 1000 resolution.
All measurements are in inches. And I didn't note the width of all the tabs in the drawing, but they're 0.75". It'd get too cluttered with them in there too. Also, if you have A/C in your car, you'll need to bend the hardline that runs to the condenser in order to fit the box in. And a 5" filter will fit just barely, as long as the connector section is about 1" or less. If more room is needed, you can move the AFM attachment point closer to the passenger-side of the car.


All measurements are in inches. And I didn't note the width of all the tabs in the drawing, but they're 0.75". It'd get too cluttered with them in there too. Also, if you have A/C in your car, you'll need to bend the hardline that runs to the condenser in order to fit the box in. And a 5" filter will fit just barely, as long as the connector section is about 1" or less. If more room is needed, you can move the AFM attachment point closer to the passenger-side of the car.












