The 2300 on a Funtana 90 works well for 3D, plenty of power and speed. I put a gallon through mine this week and it will yank the Funtana plenty hard enough for 3D. I use the 17X6 but I would be willing to bet the 17X4 would allow quicker revup time, not that the 2300 has any problem with the 17X6. Forget about the 18X6 though as it loads the engine too much except for just flying around the sky.