Hello T�n�r� New Boy!

In the UK, get them from the DNA preferred distributor, which happens to be BR Special Tuning.

http://www.motorcycle-exhausts.co.uk

If you want to buy your Stage 1 filter, and Stage 2 snorkel replacement from them, you can have my restrictor insert for free.

I've never used it, and never will.
PM me your address.

Let me tell you though, the Stage 1+2 with Kev mod and Kev O2 mod is the best Power vs. Money trick you can do to your bike. �60 for the filters and another �90 (roughly) for the mods from Kev, and it's like an entirely new bike.

(Just to be clear, I don't work for BR or for Kev!)

__________________
Bike: 2013 XT660Z, TKC70 tyres

Mods:
Barkbusters, Scottoiler, DIY Tail Mod, DNA Stage 3, Power Commander V & O2 Eliminator, Exan X-Black Stainless exhaust, Tool tube, Ohlins linear front fork springs, Nitron rear shock, JT front and Supersprox rear sprockets, D.I.D. VX 520 chain, Adventure Spec bashplate, DIY USB Outlet, DIY chain guide, Kev's Throttle mod

http://www.facebook.com/onemooseonemotorbike