if you plan on keeping it.. i say go for the f4i.... i love my f4... but one thing is stopping me from doing much upgrades to it... which is carbs.... i really dont feel like opening itup... and taking it apart each time i add something new to it.... and i dont wanna pay hundreds to a shop for that tast..

where as on the f4i... you just a PC3 and hook up the laptop load the map and go.