I have a complete stock 2008 XT660X. Just removed the snorkel on it,didnt change anything else and must say that there is a noticable diffrence in performance gain. Not much,but in the lower revs it pulls slightly better. Am gonna order the stage 1 & 2 aircleaners from OTR now. Still waiting on the MTC 2into1 exhausts to be available. Have just tried to order the KEV fuel mod from the forum but I can't seem to get my paypall account registered...

Anyway... You can definatly feel that there is alot more power in that engine than the way it rides coming from that factory floor...
Why don't they make em with good filters and exhausts stock???
But then again... You won't have the fun of modifying it yourself.

Stage 1&2 DNA filters ordered,check.
Diden't want to wait for the 2into1 so 2into2 exhaust ordered,check.
Fuel mod ordered,check.

Hope everything gets here before end of the week and then I'm gonna have a fun weekend

Now just having to explain to the misses...
Start doing the dishes...CHECK

Welcome to he forum, mate.
Great choice. Once you have done a all the mods you will find yourself owning completely different bike.

Good luck.

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that is how i feel about my XTR
Mods so far:
Hyperpro front springs; Hyperpro rear shock spring; modified air box; LED tail light; LED indicators + new relay; YZ pegs; Lucas aluminum bar; brisk spark plug; snorkel removed; DNA stage 1; second hand DynoJet O2 mod; crash bars; front and rear steel braided brake lines; soft EBC brake pads; mitas 07 tyres, 2in1 Metal Mule exhaust, Blocked AIS, tall OEM screen, OTR bash plate

Very true but ask yourself the question? are you in it for the long term!! because if you are buy a PC new or secondhand and don't forget the holes in the airbox you'll end up with a bike a world away from a stocker.

I plan on keeping this bike. it's way to handy as a everyday ride. But yesterday I spend over 600euro's on filters,exhaust,fuel mod and some stuff to make a tail tidy... PC is a little over the budget right now. Just spend 4000euro on that bike last week. Gotta stop somewhere before my wife kills me
besides,if so many people use the fuel mod I imagine it'll do the job not?
It's not a race bike,I use it everyday to commute.

however,I am still doubting to fit the PC. Am a little worried about damaging my engine. Anybody ever had engine troubles after using the mod and doing serious milage?

Hope you've ordered an O2 controller too for that full-flavoured experience?

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Euhm,no... What does it do and what's the diffrence?

I have owned alot of bikes before. Everything from naked bikes to fully custom build choppers,to race bikes and even stuntbikes... Practically all I do is tear apart and rebuild bikes...
But I have to say,this XT660X is by far the must fun bike I have ever had.
I bought it as an everyday ride because I'm quite tall 1m94 and all my other bikes,specially my choppers are too small for me and give me back problems if I ride em everyday.
After spending one day on the XT I even sold my car cause it rides so well.
Finally a bike that's big enough for me!!! And the handling and brakes!!!
When you're used to riding a Harley this is heaven. After 5 corners on that thing I was allready going round the bends flat on the side,one foot sticking out and I can stop it on a penny. Only prob was a little lack of power and the awfull lawnmower sound of those huge pipes but this will be sorted soon
And the afwul blue colour... Still looking for some diffrent plastics and a black seat cover

Hi Guys,
So I have a 2009 XTX with the MTC cans with the NitroX (Soon to be replaced with Kev mod and O2 controller) set to max and I have increased the CO at the dash by 5 points. Yesterday I fitted stage 1 and 2 DNA filters..... WOW! What a difference, pulls like a train right through the range and the Fat mid range is brill! Love the extra induction roar too and the louder pops on the over run (Read "Kid at heart").
I have read about removing the snorkel and drilling holes in the covers but is that still necessary with the stage 2 filter as I would have thought the snorkel is practically redundant now as most of the air is going to come through the stage 2 filter surely?
I have also noticed that the surging has been worse lately. I suspect its because the air temp over last few days have been around 0 degrees Celcius. Would that be right? Anyway, when the wife isn't looking at my bank balance I will be getting the O2 controller to hopefully fix this issue once and for all.
Anything else I should be looking at. Already doing the regular maintenance and chain tension checks.
Ta Brian