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true with the new impreza. that class A8 (FIA classification) also , if i remember correctly, limits turbocharged engine displacment to 2.0 liters. which puts the new STi over the limit. this is why you dont see the rally cars with the 2.5 liter sti engine. There are other classes that the 2.5 engine can be run in. but its not group A. Rallying in the states does not go by FIA classifications. although there are simmilar classifications. Most of the big name race teams race in the Open class, which basically means the body has a stock appearance. but under the hood anything goes... In 2000 the scca adopted new classes the almost mimic the FIA. but there are still some differences..
as far as horsepower goes. the group B rally cars were the monsters. many of them with 500+hp, for instance the Lancia delta. This car could accelerate from 0-100 kp/h in 2.3 seconds on gravel!!!! but when you have a turbo and a supercharger on the same car.... WOW... you had the supercharger for low end power and the turbo for high end power..
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