I've been wanting a Turbo XS utec for quite a while, and i wanted to know what else i'll need with the ecu?

I already have intake and turbo back, do i need the wideband tuner?

how dummy proof is this?

 

you do not need anything with the utec. of course a wideband will be a nice addition but you don't need it. you can install a utec on a stock car and you can do it on a modded car too. it is very simple to use but like any other EMS, it CAN blow up your engine if you are not careful or you have no experience with tuning.