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Air intake systems

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TJ Apex

Joined: 29 Jul 2005
Location: Mountains of SoCal. 6257 elev.

PostPosted: Sat Jun 24, 2006 6:51 pm    Post subject: Reply with quote

I did some research, and didn't find the exact one, but I went to K&N's web site and did a search using the dimensions of the filter it self and found one that is real close.
The P/N I listed below would the closest to the one I have, the only difference is the flange I.D. on mine is 2.875, the one listed is 2.750, an 1/8 (.125) smaller
The filter is in the "X-Stream" filter group, meaning that the nose is a filter also, not just a steel or rubber cap. Plus it has a mounting hole, and I used it to mount the filter to the inner fender well.

RX-4870 Product Specifications
Product Style: Round Tapered Universal Air Filter
Base Outside Diameter: 6 in (152 mm)
Flange Inside Diameter: 2.75 in (70 mm)
Flange Length: 2 in (51 mm)
Flange Type: Centered
Height: 6.5 in (165 mm)
Top Outside Diameter: 5 in (127 mm)
Top Style: X-Stream
Top Material/Finish: None
Filter Re-Oiling Amount: 1.16 oz (34 ml)
Weight: 1.4 lb (0.7 kg)

I copyed these specs. from K&N's web site.

There were listings for a 2.875 flange I.D. filters that were not the
X-stream type filter. All the dimensions matched to the one I listed above,
but they'd just have a chrome cap at the end, plus it might be less expensive too.

Hope this info helps ya...
2002 Wrangler Apex
Why do I have to press one for English?!
Welfare recipients should pass a drug test to get paid…

02' Apex Edition,
2" BB, 31" BFG AT's
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Joined: 08 Jul 2006
Location: burlington vt

PostPosted: Sat Jul 08, 2006 11:36 am    Post subject: true flow foam filter Reply with quote

i have a true flow foam 5.5x9 filter that i purchased from allong with the rustys intake system that uses one bolt and two claps to attach it after removing the stock airbox. the filter was $38 and the rustys air tube was 30. definatly a cheap ay to go. i opted for this setup for a couple of reasons. 1st is that it doesnt cost $200 or more as with the other systems. 2nd the foam that the filter is made of does not alow the fine dust to pass through and still gives u a high air flow volume. 3rd the filter uses a similar cleaning and oil system as k&n and is reusable.

it does sound different (it gives it a deeper tone) and i can notice a difference in the power that it gives me. i am concerned about taking on water when im wheeling in the deep mud but for the most part i have not run into problems. i recently did a stream crossing where the water came up do the doorjam and when i entered the steam was pretty high on the radiator and had no problems

my future mods for the intake are to do a derivitive of the macb cowl intake writeup. what i want to do is make a waterproof box that will mount above the engine and be supported by the radiator brackets, as well accept my true flow filter and have a removable lid for filter cleaning. from the box i would run a short intake into the cowl. also what i wanted to do was to use a air scoop over the cowl intake and custom cut a foam filter to fit the space between the hood and the top of the air scoop. if i do i will post pics for everyone to see.

here is a link to a test video of the tru flow filters.

and a link for tru flows example dyno sheet.

hope this gives u some options.
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