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Discussion Starter · #1 ·
I got my K&N filter today RU-1770 that was mentioned right here on the great PRC and installed it tonight. The install was easy as pie. Unclamp the factory box and clamp on the new filter. The K&N has a 20 degree angle on it so if you put the tilt towards the firewall there is plenty of room for the storage bin. I also removed the stock filter from the air box.






I also decided to enlarge the holes in the exhaust gasket to allow for more air flow, also another good piece of information from the PRC. So after the filter install I disassembled the Y-pipe from the head. The exhaust gasket stayed on the head just like I wanted it to. However the the holes in the gasket on mine were exactly the same size as the ports in the head. I was hoping that it was a little bit smaller than the ports so I could open it up some to gain better flow. Anyhow no need to fire up the Dremel tool on my gasket. The picture isn't the greatest but you can see that holes in the gasket are the same size as the ports. Not the easiest place to take a picture. Maybe tomorrow evening I'll get a chance to take her for a spin and see if the new filter helped things a little bit.




I also installed two sets of those rubber spring spacers I picked up from Mike at Greenfield Motorsports today for my front springs. Another easy install. I jacked up the front end and popped them in. They should really reduce the front end squating especially when I've got the plow on.


Brian
 

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Looks good Brian, Thanks.
 

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i've done away with the stock air box, as the diameter of the box going into the boot is pretty small. I've replaced it with a piece of 2 inch pvc, along with extra 2 in hose, attached to the hose running up to the front.

makes a modest gain
 

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Brian,

Have you tried it yet to see if there is a difference?
 

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Yeah, they make things called "Outterwears" that pull over the K&N filters to help keep the filter clean, or at least free of larger particles. Really helps the life of the filter.

Also, you said you removed the stock filter but left the canister? I would make sure to seal up that canister, as without the tension of the stock filter inside it, you may get air leaks. I haven't inspected the whole setup closely, but I am always nervous about intake systems failing. I've sucked enough sand on different vehicles, even after taking all the precautions, to be wary of shortcuts.

My opinion, the set up where the larger K&N filter replaced the canister under the bed looks like the best way to go. That little filter doesn't look like it will let enough air through. Please let us know how it works.

Matt
 

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Discussion Starter · #10 ·
I'm not really sure I can tell a whole lot of diiference to be honest with ya. Maybe I'll try going with the K & N in the air filter box and see what happens. Has anybody found a K&N that fits in the stock air box? If so whats the part number?

Brian
 

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Brian,
I'm not sure but I'm thinking I saw a post on the old forum where someone had replace the underbed filter with a K&N filter. I looked on the parts list attached to this section but found nothing.
Joe in Tucson
 

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Discussion Starter · #12 ·
Thanks for checking Joe. I know K&N has a web site with detailed specs of every filter they manufacture. I could get the dimensions off the stock one and see if I can find a match. In the event that I do or anyone else finds the K&N part number for the "In the box" filter we need to post it in the important parts section.

Brian<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by jaybey

Brian,
I'm not sure but I'm thinking I saw a post on the old forum where someone had replace the underbed filter with a K&N filter. I looked on the parts list attached to this section but found nothing.
Joe in Tucson
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
 

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I know I saw someone here who replaced the underbed filter and canister with a clamp on K&N, then built a slick little aluminum gusset to support the free end of the filter. That is the way to go if your trying to get a lot of air into the motor.

Matt
 

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<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Cervezamatte

I know I saw someone here who replaced the underbed filter and canister with a clamp on K&N, then built a slick little aluminum gusset to support the free end of the filter. That is the way to go if your trying to get a lot of air into the motor.

Matt
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

That would be me.





 

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If anyone finds the filter # thats goes in the cannister please let me know.
 

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Discussion Starter · #16 ·
Hey Chuck, I know you posted the etails on this mod, part number and when you originally posted this but could you give us the details again please?

Thanks, Brian
 

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I have been on K&N's site, they say they do not have a replacement filter that goes in the factory housing for the XP.
 

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Desert Rat: When you installed your new air filter, what did you do with the sensor located in the old filter housing? What is that sensor used for? Thanks, Harry
 

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There is no sensor in the air box of an 05.
 

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Doesn't Bikeman have an air filter for the stock airbox??
 
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