While I am totally against forced induction systems for a factory built normally aspirated engine, the only way to do it is have a lot of money.
A good friend has a '95 ///M3 that he has grown bored with. As he wishes to turbo charge his whip, it is costing him mucho dinero. He only does things right, Delk Racing (a local mustang tuner) is blueprinting and building him an entire system. Out of the dozens of tuners around the country, they were the only ones willing to do so for under his allotted budget of $8K.
Unless you are planning on doing the same, stay away from such temptations, unless you are just into ruining good powerplants in order to have a few thousand miles of fun.