Just thinking...
on my old bikes from the 80ies i had before
i always had an K&N filter direct on the carb and than an extra on the crankcase.

would there be any reason not to do the same on the xtx?
- one main filter
- one for the crankcase
- making an ais mod

in this way you could even save some weight-

or am i just missing something?

I do not immediately see a reason to dismiss the idea, IF you never ride in the dirt or the wet. Otherwise I would definitely not do it.

It will require fueling modifications as well.

http://www.xt660.com/site/node/310

like that?

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jo like the stage3 but without the "heavy" box around and you would not need the rubbertube between the throtlebody and the filter.

and i should be lees expensive too.

from K&N you could even buy that extra "sock" to pull over the filter.
its against mud and dust

duibhceK....if i take the pc3 and make a map with the new filter than i should not need any fueling mod? or was there another problem you thinking about?

pc3 is a fueling mod in my book

I saw one of those on a car. A filter for a filter seems to defeat the object.

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it is not a real filter in that way, just a safety feature.
but as i do with carbon i maybe could made an some kind of protection without building a big heavy and "airbraking" box

Biggest problem with a cone filter and no airbox with fuel injection is getting an accurate and consistent air temperature reading for the ECU. In addition you'll have to fabricate a mudguard and something to fill the gaps to stop crud getting everywhere you probably won't save much weight anyway! Also in my experience (even with carbs) removing the airbox seriously robs your motor of torque in the low and mid range. The only bikes I've ever found that improve when removing the airbox are carb fed 2 strokes, but i'm more than happy to be proved wrong...

Not to prove anyone wrong but just to give the facts on these XT660 motors. I can provide a completely standard air box against the stage 3 air box dyno result, the results are similar to the attached dyno run below with a little loose in torque around 2000-2500 rpm. The length of the cone to the throttle body is important in how much torque these motors produce, Freez has done dyno tests to back my statement. So bolting on a pod filter directly to the throttle body would more than likely loose a bit of torque as mentioned.

The dyno results below are with an open air box stage 3 against the standard XT air box with stage 1 +2 filters.

Stage 3 in RED
Stage 1+2 in BLUE

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
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My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

i absolutly do not wanna loose som torque...especially not in the low end and the middle....so i would have to have a cone between the filter and the throtle body.