Guys, I'm getting dizzy reading all this threads and it seems I'm going in circles. I've just ordered this two filters:
https://www.e-dnafilters.com/Product.asp?ID=810
https://www.e-dnafilters.com/Product.asp?ID=1211

I intend to mount it on the bike and also remove the snorkel. Do I have to use some additional "toys" in order not to damage the engine or to have this mod working efficiently? Is it ABSOLUTELY necessary to have an Kev fuel mod for instance? Please enlighten me.

Thanks in advance.

I would recommend both a O2 controller + fuel mod or if you have the cash a PCV with Dyno Jets O2 optimizer + a custom map.

The two mods can be bought from this link: http://www.ebay.com.au/itm/Yamaha-XT...item20e9619ce4

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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 /
[
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

Thanks Kev. It's a good hint. It's also good value for money. But next week I intend to leave for vacation on the bike of course and I cannot wait for the package to arrive from Australia. The filters will be here by the end of the week.
My question still stands: is the oxygen controler/PVC absolutely necessary? If yes, I'll posted pone the filters change for later.

Cheers,
D.

The motor will run dreadfully lean with a stage 3 filter setup (the two parts you mention + snorkel removal). I'd say you might be OK for a very short period as a stop-gap without fitting a fuelling devise to richen things up, but I have to say I wouldn't recommend it. Sounds like your going on a longish trip too?

You could just about get away with snorkel removal and the stage 1 filter (cylindrical one) only and save the stage 3 cover for later. However, you aren't going to gain much benefit from fitting the filters anyway (unless you get additional fuel into the motor with a Kev mod/O2 controller). So all in all, IMO you're probably best ordering the parts from Kev, sticking with standard setup and fitting everything when you get back from your trip?

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Thanks for answer mate. Indeed, I intend to go for aprox. 5000 km fully loaded. Probably around 200 kg load. But I guess I have to go with stock configuration for now. It's my fault I didn't thought of this earlier.
Cheers.