Hi, I am running a Planet audio fu-18 on 2000 watts in a 7 cuft ported. I recently ordered a fi btl 18 with a triple stack magnet and it simply cannot get here soon enough. I'm curious if anyone out there would be able to make a guess how much better it would perform than my fu-18 with the same wattage and I would of course be modding the ports to suit the FI.