hello mate..
to be honest i am not familiar with the speedvision specs, i dont have one here for refference, so i don't want to compare. but what i can tell you is that our manifold has very smooth runners..are bullet proof and will give you a good boost on performance. built with max flow in mind given the tight space to work with. runners are 1 1/4" inch..i think most ct9 manifolds are made with this runner size because anything larger is almost impossible to fabricate with given the right space. 7-9hp bolt on. if you really want something that will flow a lot..then have a look at our ct9 power up kit! thanks..
sacha
wickedEP Racing