Greddy xB kit vs Greddy Fit kit

[mrbond]

Well, as the old addage goes, anything can be done with enough money.
Seriously, though, there are WAY many more options as far as forced induction go. Considering how much money you'd be throwing at the hired shop to make the Fit kit fit into the Yaris, you could buy a Blitz supercharger, an xB turbo kit (would need modification), or piece together your own kit. There's a lot of threads already on the forums listing what you would need to make your own kit. Be logical, and stay away from the Fit turbo kit. You would be giving yourself a HUGE headache and punishing your wallet/purse when you don't need to.
If you do still want to blow a bunch of money on making the Fit kit work, then all power to you.