Hi! My advice would be to NOT fit the lowering kits unless you really need it. When I bought my first XT660X in 2008 I had the dealer fit the Yamaha lowering kit as I had recently had a foot op so I was not confident with the bike at its original height (I am about 178cm tall). The lowering is well done (even the prop stand is shortened) and I could sit with both feet flat on the floor BUT it was too easy to get the foot pegs scraping on the road when cornering with enthusiasm 2 up!!
I now have a 2011 XTX at the standard height and I cannot scrape this one and the handling is far far better even with some weight on board. I am having so much fun that I have covered 6000 km in the last 4 months and I am now just starting on the mods, wot fun!!! Ciao Simon

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(Now sold on, sob) 2011 Blue XT660X with gold wheels, was 26,500 km.
Engine mods: K&N Stage 1 filter, DNA Stage 2 filter, snorkel removed, Kev fuel mod fitted.
Plus: smoked Puig screen, Yam aluminium sump guard, Yamaha / Acerbis handguards, Givi Trekker aluminium side cases, Leo Vince X3 cans plus Kev front fork mod and Fender Xtender. Just fitted Michelin Road Pilot 3 tyres.

SOLD the XTX for a Super Ten 1200. And just bought a Raptor 700 so staying on here for some tips....