the ct kits are the best of all the a/m cylinders..the vitos os basically a budget setup for a BB....i dont think that the viots kit has much of a different port layout. THE OTHERS DO. as wildcard agreed teh tripple exhaust ports on a vitos are very restrictive, and not really an optimum tripple exhaust port. the others are def a better overall setup...this goes back to "get what you pay for" for somebody wanting a BB on the cheap and easy, a sleeve is the way to go. as i was saying not much different from the vitos, as i have seen both together.....that TEP is added. TEP are def a bonus, and im not saying they are a gimmick, but in the case of the vitos cylinder, they are just about worthless.....you want a good quality part that makes great power.......spend the money....im not doggin the vitos, lots of guys run em, they make great power with em too....to me its like the difference between a vitos BB banshee cylinder and a cub cylinder....you want good TEP's and make a ton of power, run a cub cylinder.....
thats what i was getting at.....i agree with wildcard......