not sure if you have to upgrade injectors but if you do the 13b injectors fit straight on... all you need to do it cut aprt of the plastic for it to fit in... i havent done it but am going to and this is what i have been told...
EDIT: oh yeah that means that the rx7 ones do fit if it is a 13b one... i am either gonna do that or go for 660cc cause i wanna do a full power rebuild