how much are these to buy normally for an erst,ive got a t34 size turbo on mine but its got a .63 housing on it and im getting fed up with the lag now,i was going to put my old turbos exhaust housing on it (saab t3 with .48 housing) but the exhaust outlet hole was to small so it wouldnt have fiited over the turbine blades any help is much appreciated,i will whip the elbow off at some point and measure the hole if thats any help