[89Turbo944]

Well it sounds like it would be a good idea to get it tuned by a professional.

First off you will need more than just a turbo and exhaust to make this all work. A boost guage would be a good idea, as well as AF guage.

The fuel map will most likley need to be re-programed because with an upgraded turbo you will be flowing more air so it will need more fuel, if this does not happen you hit fuel cut. Not good.

You should look into the subject a little more and find out exactly what you are planning on getting to make you 100hp extra.