I know on almost every engine coming out of GM, U can modify to get an extra horse here and an extra horse there, but is there any mods available to boost power on a Northstar V.8. A chip, exhaust, K&N filter, anything?

The Corsa exhaust will make a decent improvement. It will provide a little more power, but will also make it sound mean as hell. As far as mods for the engine go, it hasn't been out very long, so people really haven't had a chance to mess with it. I think that the same thing will happen to the new one, that happened to the older generation N*'s. There just isn't enough market for a performance parts. This means that companies aren't willing to invest in engineering stuff to make them more powerful, because there's just not enough money in it. Perhaps in the near future, there may be more interest. It would be nice to see companies get involved with the N*, but so far, no one really seems to pay much attention to it. Mostly because it's pretty much maxed out for power in N/A form. Forced induction is always a possibility, but would require tuning, which no one will probably be able to do. Hell, they still can't do it for the older engines. You might be able to find someone who can make some custom higher flowing exhaust headers (although the OEM ones are not that restrictive). To be quite honest, there really isn;t much that can be done other than exhaust.

There are companies that specialize in the mods of the Northstar. I know if you are in Chicago land area, Rick Dyers builds northstar race engines.

The same problem arises with modifying the engine while still in the car, that does with the older models. Until you can retune the PCM, so that you can properly adjust for any modifications, you run the risk of severely damaging the engine. Until such progress is made with the PCM, exhaust, and air intake modifications are pretty much the extent of what can be done to a stock engine, while still retaining any sort of driveability, especially while in the car.

All those aftermarket companies building supercharged, and twin turbo N*'s, are using stand alone ECM's. This allows them to tune the engine to run properly with whatever modifications they choose to use, in whatever vehicle they want.