Okay, so I figured that this was worth noting. I have looked around for information on good performance mods for the 3.8 Series V6 firebirds. I've just about come up with diddly squat except for a few things like the Virus and Pathogen Project V6's that are running some nice Centrifugal Superchargers and pretty impressive power. I haven't tried to contact these guys yet and figure out what all they did to their engine, but they lay it out pretty well for those who could figure it out with some research and knowhow. I started thinking I should check the Aussies out, as they tend to be known for some outrageous stuff even in the GM land of Holden (The creators of the 'new' GTO if ya didn't know).
Forced Induction Technologies is possibly the best lined up site for performance mods to the GM 3.8 V6 so far. This is geared solely for the Supercharged L67 Spec engines. You'll have to read through some of the stuff they pull in these cars on the track. Just breeze through it and you'll find some really nice goodies, including their Turbo Test Mule that was running somewhere in the 11's in a big, heavy assed Commodore on street tires.
This is the stuff I am really looking into, and I like the intake design for the supercharged engines, very worthy application even on a firebird. Just an expensive route around getting an LT-1 or LS-1, but damn the bragging rights for pulling off a mod like this and getting it to hunt and grunt.
Check the site guys, it even has some nifty vids...