Which power adder:

[KPWSerpiente]

when you are "racing" you are governed by rules.
Very few racing classes allow for adding forced induction, and none allow for nitrous.

and I could give a shit about drag racing

in road racing, usually only some level of a motor build is allowed. Ranging from a "stock" build (showroom stock, SM) to a full race motor build (WC, production, prepared, etc)

ultimately, you want to get the most power as legal under the rules. high dyno numbers, low 1/4 mile times, etc dont mean a damn thing in real racing.

Thanks Evan! Your entire post offered no answer to the question.

But it did remind me that a N/A set up might be desirable to some people and I should have had it as one of the choices.

I'll brush off your comments about real racing. They are about as lame as a marathoner telling a sprinter he isn't a real runner.

I myself am also a fan of turbochargers. On a 4-6 cylinder engines I think they are the perfect choice for making a bit more power. Kits, if your car is not blessed with one, can be expensive but nitrous oxide or a supercharger isn't going to be free either. Generally they make more power, boost can be easily adjusted, they don't need to be refilled, and when you arn't running on boost you can still get amazing gas mileage.

-T

*edit, just saw this:

well correct me if I'm wrong, but a single turbo will be felt most of the time at higher rpm's once it spools up. Whats the advantage of twin turbo's (i.e. Supra's and the new mercedes V12 )? Does this help with extra bOOst through the full rpm range?

A twin turbo set up where both turbos are of equal size is usually only going to be found on a V engine displacing more than 3 liters. It isn't practical on a smaller inline or horizontally opposed 4 cylinder engine because there won't be enough exhaust gas to spool both turbos.
They will not make as much power as a single large turbo, but they also wont' lag as much and that is very important in cars sold to the general publics.

A sequential turbu set up has two different sized turbos. One smaller one that spools up quick, and one larger one that creats more power and will literally take over when needed.

-T