I am interested in what mods everyone here has done, and whether you think the mods were worth it. Include track or dyno gains if possible. It would also be interesting to see where there are "needed items" that aren't available yet.

Well I'll post what I will get in the near future since nobody else is saying what they have. I don't have any mods at this time...waiting to get to Texas. B)

I'm starting with the basics after I have about 2K on my Goat:
1. K&N air induction kit
2. Plugs and wires (NKG/Taylor/MSD?)
3. Optima battery
4. DiabloSport Predator tuner

Later down the line:
1. Long tube headers (not sure whos yet)
2. F.A.S.T. intake manifold

So far I've installed a cam and springs, torque converter will be installed this week. After the converter I need to find wheels for slicks or drag radials. I'm waiting for Kook's to finish their headers, they were supposed to use my car for the test fit but I wasn't able to leave the car there when they needed it.