From what i've read, small turbos can produce just as much boost as bigger ones, it's just that it's inefficent because it builds up much more heat, so even though same levels of boost, it's feeding hot air instead of cold.Originally posted by Viprman:
It also depends on which size of turbo you get. A smaller one, may not produce as much as a larger one, but the smaller turbo will spool up faster and create boost quicker. The smaller ones are used usually on smaller displacement motors that don't have a lot of power to begin with. The smaller turbo builds up boost quicker so there is less lag and the small engine (say a 2.0L) will produce its power at like 2000 rpm to get up and go. The Eclipse/Talon motor comes to mind.
Some of the bigger engines (like found in the 3000 GT VR4 / Stealth TT) use a twin turbocharger setup. The reason for this is that one acts as a "primary" turbocharger and the other a "secondary." The primary turbo is designed to get the car off of the line quicker and the secondary is to carry the car up into the higher levels of speed. I don't know if there would be enough room for a twin turbo setup in the Intrepid.
Also, with the turbocharger, new intake and exhaust manifolds will have to be fabricated. Downpipes and intercoolers will be needed. More fuel will be needed and computer to handle positive levels of pressure. This could get complicated. If I had the $$$ it would be a fun project to figure out!
I hope I added some insight to your question. I ignored the supercharger aspects because others covered it well enough, and I am not as knowledgeable in that area.