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After installing a UNI filter I noticed some dust was leaking around the air box lid and into the clean chamber. It seems that the air box inlet does not allow enough air flow into the air box at wide open throttle which causes some leakage around the seals. My plan was to simply build a snorkel from the air box back behind the glove box that will allow extra air flow while still using the 'cleaner' air that comes from inside the cockpit. All pieces were bought at Home Depot for right around $20.
This piece is a simple floor drain that I cut out the strainer section and filed down the inner flange for maximum inner diameter.
![strain.jpg]()
After cleaning it up I've got about 1 5/8" which is just a little smaller than the factory inlet that measures 2" ID.
![DSCN1567.JPG]()
I used a cheap angle fitting for my drill and cheap hole saws from Harbor Freight to cut the hole directly opposite the factory inlet. The floor strainer is perfect for this because it has an outer lip/flange that allows it to be glued right up to the side of the air box and seal it tight.
![DSCN1570.JPG]()
Finally I started putting all the pieces in place and cutting the pipe to size. It all fits right behind the radiator filler spout and just above the brake master cylinder. The cap for the master cylinder does come off and just bumps into the piping just a bit. Once everything was cut and fit I marked everything with a sharpie so I could glue some of the pieces on the bench correctly aligned.
![DSCN1579.JPG]()
![DSCN1578.JPG]()
![DSCN1576.JPG]()
Here's a picture of what the assembly looks like out of the car. I installed an extra piece of pipe at the inlet to get the inlet down towards the bottom of the glove box where I think the air will be cleaner. That's the piece all the way at the left.
![DSCN1575.JPG]()
Hopefully this will get enough air flow so the air box is not starving and it should prevent any more sealing problems. I've put the UNI filter back in after cleaning all the grease wiped off to give it a good test.
This piece is a simple floor drain that I cut out the strainer section and filed down the inner flange for maximum inner diameter.
After cleaning it up I've got about 1 5/8" which is just a little smaller than the factory inlet that measures 2" ID.
I used a cheap angle fitting for my drill and cheap hole saws from Harbor Freight to cut the hole directly opposite the factory inlet. The floor strainer is perfect for this because it has an outer lip/flange that allows it to be glued right up to the side of the air box and seal it tight.
Finally I started putting all the pieces in place and cutting the pipe to size. It all fits right behind the radiator filler spout and just above the brake master cylinder. The cap for the master cylinder does come off and just bumps into the piping just a bit. Once everything was cut and fit I marked everything with a sharpie so I could glue some of the pieces on the bench correctly aligned.
Here's a picture of what the assembly looks like out of the car. I installed an extra piece of pipe at the inlet to get the inlet down towards the bottom of the glove box where I think the air will be cleaner. That's the piece all the way at the left.
Hopefully this will get enough air flow so the air box is not starving and it should prevent any more sealing problems. I've put the UNI filter back in after cleaning all the grease wiped off to give it a good test.
