From what I've read, the scorcher resembles a mini-tune. It ups the boost output to increase more power while still maintaining the factory tune. There's a 5 page thread on the scorcher module and user's opinions.
Tuning is a complete computer overhaul and voids your warranty through the dealership, in most cases.
Jus use the search function at the top right of the forum and do mass amounts of research before you make any decisions... There are many threads on this topic to review!