Does anyone know of a good affordable turbo for an MR 06?

 

There are group buys on new turbos in the for sale sections or you could purchase a turbo kit from an individual who went with a different solution, or you can have your turbo re-worked. Since this is your first post I suggest you lurk around the forums a little before even considering a turbo upgrade. Also any turbo upgrade will require tuning, supporting mods, and will affect drivability of your car. Do lots of research before even considering upgrading your turbo. If possible ride in a car that has the setup you are considering so you can see how drivability will be affected.