I have a C'zar 4bolt booster on my Koxx Levelboss (26") and theres no noticeable flex, like I can't feel any flex (but theres always going to be a little bit there) Also I thimk black would look best on your bike - call me boring but your bike has to many colours, and I don't think a silver booster will look to nice either. Also the Tensile 4bolt boosters are awsome, just a little on the heavy side.