the t3 is used on many turbo'd cars. so it more popular, and hence being cheaper

the t2 is used on the frst, and 5gtt i think. so a bit more scarce

you wont need 2 uprate the injectors, they will easily flow 180 bhp. so you can still run 12psi on a chip and it will be fine

and here's a guide on how 2 do it. its easy
http://www.fiestaturbo.com/content.p...rmat=showphoto