question Vivo, the one with the stubby muffler only has one shock, doesn't seems really safe for riding.
Stubby used a different swingarm and bigger shocks (SYM Shark 150 Mono Shock) and later included a rear disc brake conversion...
Safe? So far, no problem.
![](http://i595.photobucket.com/albums/tt40/test1204/my%20s8/s8%20extended%20wth%20rear%20disc/100_1062.jpg)
This is the SYM Shark 150 with the original mono shock.
![](http://i124.photobucket.com/albums/p10/terminator02/DSC05125.jpg)
This s8 has a different mono shock mod... Not a DIY tho...
![](http://i578.photobucket.com/albums/ss222/joelslow/slideshow/JORDAN/7.jpg)