Thanks for the replies everyone, Jay i got confused when tony said that i need a .63 i thought it was exhaust housing for 440bhp lol, on the TT card that i got it says .63 A/R and part S241 so i guess that must be the compressor housing then, didn't know a smaller housing could make that much power, cheers for the info.
Tony can you clarify that i have a .55 exhaust housing because i think i might have screwed up when i sent my old chip back for a new one...