With regards to the back end of the bike. I like the standard cans... although obviously heavier than aftermarket, I like the way it all looks, and to be honest although the MTC options do look nice sometimes I just dont get the gap that comes from them being so straight out . I also not fussed on a lop sided single can look... even with a tool tube on the other side.
The only cans I have seen that mimick the shape of OE is from GPR, not sure what they are like mind.
Also the rear end in regards to tail tidy. Its another thing I like that is original, but I see some have chopped it up to make it neater. Is there a "How To" anywhere ?? I was going to get the R&G one but its another thing Im not sure looks so great

I did a "no cost" tail tidy which retained the original lights/number plate mount and involved minimal (and reversible) damage to the rear of the bike...

http://www.xt660.com/showthread.php?t=18310

Scorpion do a twin can system that looks quite sweet and follows the exact lines of the original pipework...



However, I'm not so sure the pipe linking the two sides will clear the tyre on full compression though as its much further to the back than on other twin pipe systems??

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Got a R1 back light conversion on my xtx, but the standard stuff had to be cut off, and you couldn't replace it unless you bought a new tray, I'll take a pic in the morning

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you win some, lose some, crash some
K+N filter, snorkel removed, homemade kev mod (with his blessing), co raised,
Pipeworx cans, r1 led back light, under tray removed, small indicators, handguards, cnc short levers,

Im swayed towards the one from OTR.de , but its a bit bleedin expensive. Out of everything Ive seen so far its the nicest looking tail end. I am still sticking with standard exhaust at the mo, and Im guessing the cat being cut out will happen soon.Mind those Scorpions are lurrvvly !!
Its proving a bit of a financial nightmare this bike !! Theres just too much bling that would be nice to buy !!

I'd keep the original can, get rid of the catalyst and AIS system to save some weight and move the license plate to just underneath the tail light, then cut the rear end just below the indicators. That's the cheap option.

I have and really rate the Leo Vince rear bits (original 2 pipes and retained cat) and they took almost 7 kgs off the bike as I remember. Ciao

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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....