if your car is running standard then no point changing the TIP. If you have remapped it then its advisable and is a sensible mod. Apparantley they can split at high revs when running more power, and plus they are better built so i also heard they improve performance slightly. I just remapped mine from Performance Torque few weeks ago, so that is why i am doing this mod.
P.S. Cheers Nev, wil have a crack at it today