I would also find a new mechanic mate cos sounds like he dont know WTF he is talking about because with out bigger injectors and fuel pump a bigger turbo is useless to you! if you wanna do it cheap buy a 2nd hand GTR fuel pump and some SR20 injectors highflow ya turbs get it retuned if ya shop around and get lucky you MIGHT get some change from $2500 and you will be good for 250kw