no z10 setup DONT go straight on the k11.....
the only one fits bolt on is the nismo one.
-ganador one will need custom cat-back pipe or bend that shiny new muffler.
-5zigen is completely incompatible(exempt muffler) only a silence and resonator NO cat-converter, non of the piping will make sense.
-HKS one need the back pipe bent...but b4 you cut off that dildo/tonsil looking of an ugly silencer if you want it sitting up right...
if you do..buy that nismo one Mimz. i've tried it, gives you good back pressure release and sounds right too. perfect bolt on, no hassle and gives you 10-15hp+