+1 for the exhaust of choice of pleiades.

Mega light and nice sound although I did get a few comments on a recent long haul road trip that it was too noisy. However, I like it and they can go swivel! Hahaha.

As for ruggedness, it made it from Cheshire, UK to Ulaan Bataar, Mongolia without a hitch. Lots of gravel sections and offroad through various degrees of hard and soft sand.

Fitting was a bit fiddly but once. Done it hasn't move in 12000 or so miles.

Plus the single can let's you fit a decent sized tool tube like the one pleiades has (and I copied). Bags of room for tools, spares, etc.

Sandman.

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2011 XT660Z, in BLACK of course!
Mods done:
Lost the will to keep track!