Nope a new chip as that turbo will massively effect things like VE etc, HG= Head gasket.

If going for the larger turbo you are effectivly converting the car to a stage 3 as such you are now going to be producing more boost and we need to fuel for this extra boost, as such the fuel injectors will need upgrading to Bosch (Dark green 803's) or Siemens 55LB, you will also need to uprate the MAP sensor as the standard 2 BAR item will not be able to see the extra boost, all of the above will render your existing chip useless!

Martin