im using a tiger undertail to help brace the tail. its not much but its more than not using anything. i have asked several other peeps if they have seen my tail bouncing or moving and they say no. still using stock subframe and you just need to unbolt the 4 bolts that hold on the end of the subframe tail light support bracket. i used the street extended tail so i could still use my hump and passenger seat. with the tiger racing undertail i made another "shelf" under the tiger racing undertail out of aluminum so i could mount some more things like CO2 tank for airshifter, water tank for water injection, dl-32 datalogger, and relocated my battery to my swingarm. lots more room to fit other stuff too.