phoned turbo techics today and they wont sell me a .55 housing for my cossie

saidthey can sell me a whole turbo with a .55 housong at a cost of 634 not including VAT

my turbo is brand new so thats out of the question

so looks like i will be keeping it on a .48 housing on light blues my turbo is good for 26psi constant boost should still see the 360-370 mark would u not say?