Hi,
I've been thinking. Is the DNA stage 2 mod suitable for offroad use, or does it let to much dust in?

Or will I be better of using the standard airbox fitted with a foam filter ?

I have a PC3 and OTR 2-1 exhaust installed.

I live in southern Spain for a large part of the year where it is very dusty and the combination on my XT660R of Stage 1 filter (slight improvement) and the Stage 2 DNA (huge improvement) with the PC III and appropriate map gives me a great torque boost throughout the range for riding in the mountains. The Stage 2 actually improves filtering when it gets dusty as the filter oil traps even smaller dust particles as it builds up. Try one and I guarantee you won't be disappointed.

No experience of the 2-1 but I believe that you may experience even better gains in torque terms from that set-up.

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+1

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2008 XTR Mods : DNA Stage 3 Airbox, PC111, Carbon Cans Ovals, Steve Ruth built XTR734cc Big Bore with - High Desert Dyno (HDD)/ Cuervo Racing Gas Flowed / Ported Head fitted with +1mm Valves & uprated Springs, HDD 5050 Camshaft, HDD +3mm Throttle Body, CP 105.5mm 11:1 Piston, Custom Mapping, Piasini ECU, Renthal 613-01, Barkbusters VPS, Pivot Pegz, Touratech Bashplate, Foam Grips, Kev's O2 Sensor Mod, Kev's Extra Coolant Cooler, Wilbers Progressive Fork Springs and Rear Shock

+2

If oiled/ greased sealed & service regularly the stage 2 air filter is no problems in the dust. It would offer the motor more air in dusty conditions as the main filter is small & can get clogged quickly.

I also like the fact you can service the DNA filters after your dust ride & the filter is back to new, with the OEM paper ones you can knock off the dirt & that's about it the fine paper will still be full of dirt. If you try to blow off the dust on a paper filter it will compress the dust particles deap in the paper element & make it more restricted.

If you are going to ride in rivers & deap water then the stage 2 filter is not really for you, you could always modify the air box lid as shown in the mod section to reduce this problem.

http://www.xt660.com/showthread.php?t=13037&page=3

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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

Thank you all very much. I think I'll try the Stage 1+2 filter out then :-)