Hi, just looking at your questions and they are similar to what I had a couple of days ago when i picked up the xt660x

I've slotted in a new K&N air filter and bought a Nitro X off eBay for �39 it has worked a dream. The Tango Kangaroo has been tamed! Took 30 minutes from start to finish.

I searched through the site and there is some amazing info but I thought why not give it a try!

http://www.ebay.co.uk/itm/NITRO-X-FU...item5aed4ee414

I'm running stock cans on a 57 plate with 8880 miles on.

Hope this helps a bit.