only a few hundred right now. still sorting out other problems like my mystery water leak and oil drip that i cant find.
i went with the original one. i bought mine when before they became popular and they only made the original 600hp, the turbo version and the 1200hp units. i went with fitech because it had all of the features that i liked from all of the other systems on the market all in one system. there no other boxes to mount somewhere, no big holes to drill in my car for wire harnesses, it controls the ignition timing (i havent hooked that up yet, but will when i get everything sorted out), the annular fuel discharge, i liked the controller better than some of the others (i wish it had a matte finish screen, it has a gloss one and makes it hard to see under some conditions)
improvements... cranks right over and starts, no pumping the gas or excessive cranking on a vehicle that sits to get it to run. no stupid carb issues, like when you pull out into traffic with a cold engine and it pops or hesitates or dies leaving you sitting there.
i am having a problem if the fuel pump losing its prime when the tank is only so full and the truck is sitting at a certain angle. but that is not fault of the efi system, its because of the design of the tank being long and fuel all sloshing to one side or one end away from the pickup. you will not have this problem if you use the fuel canister that they sell or an in tank pump, (i have a frame mounted pump)