The 4 port has no more top end then the Elite 5........ If you guys are all using the blue 6.5 insert in the carb all the engines are going to struggle on the top end... 9901/41021 is also going to take away some top end as well......... in the end its going to come back to setup..a Elite 5 on a 6.5 mm insert 9901/21021 isn't going to have much top end, however changeover to a 8 mm insert and a 9853/41001 combo and the engine is going to scream comparatively.... The fastest way to kill the top end is to run a small carb insert !