I'm getting ready to mod my Raptor airbox, and was going to put in some of the univents in the top of the airbox. Someone here posted that they found it is very hard to blow through the foam in the univent filters, so they wondered if you are really getting any more air through them than stock. Do they really make a difference in flow/performance? I thinking instead of cutting some holes and putting an outerwear cover over them. Check it out: Link to Outerwear air box cover photos
I was thinking of cutting one 2.5 inch hole in the air box cover, and using the outerwear cover over that.

What do you guys think, Are the univents worth it, or should I go with holes with more flow?

Thanks,
Lorrin[img]i/expressions/face-icon-small-confused.gif[/img]

 

Personally, I think that Outerwears air-box cover is junk. They need to re-design it to stay on the airbox better.

Anyways, with the engine mods on my 400, I needed to completely remove the airbox lid to get the full effect of the mods, but didn't feel comfortable doing this. So, I went to the hardware store and got a 6" round metal vent, usually used on a house. It has one-way metal slotted air flow, and on the inside of the vent, has a screen to keep big stuff from getting pulled in. I cut a 6" hole in the airbox cover, and used rubber cement to bond the metal vent to the plastic airbox lid. Once dried, I used caulking to seal BOTH the inside and outside edges of the vent (to keep as much water out of the box and to keep from eating away at the rubber cement). I also put an Outerwear cover on my K&N filter.

The result: The quad gets all the air it needs for the 170 K&N main jet, and the true test, I went for a ride for an entire afternoon in a downpour and got almost no water in the airbox. Granted, you will need to clean the Outerwears & K&N filter more often with a vent that big, but as I said, its better than having a big open airbox for stuff to fall into.

 

depending on the riding you're doing will also make a differnce. We ride just in the dunes, so we leave the lid off and run a outerwear on the K&N and also a outerwear airbox cover, and it works well.

Also on the Raptor, you can tear out the baffles in the air intake, but you have to jet it up bigger, but it will breath and run quite a bit better.

 

One of the mags done a product evaluation on the outerwears airbox cover about a month back. Results...it would'nt stay on correct. It seams there is sealing problems where the outerwear attaches to the box.

 

The outerwear attaches using velcro and when it heats up the adhesive comes off of the velcro very easily. There is a review in 4 wheel atv action (cant remember if its the July or August issue). They also stated that the outerwear itself was succeptible to tears.