Ok thank you GOJIR4, I just saw the GT2860 and thought I was in the right place.
Yes I'm aware that the turbo is not a bolt on, the reason for my queston was because the factory air intake was on when the car was bought. I guess thats why its now carcked and has a rough idle, some one has fitted a 2.5 over a 3inch (must have heated it up).