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It's not often when the closing of loopholes reveals good news for a company. In Cadillac's case, it resulted in a horsepower bump for its 4.4-liter supercharged Northstar V8. GM announced back in April it was the first automaker to follow the SAE's new voluntary, third-party power and torque testing and certification procedure, which was designed to eliminate automakers' use of "best-case" scenarios when rating horsepower, making the results more likely to be repeatable in the smoggy, humid environs of the real world. For the Chevrolet Corvette Z06, the first GM car to be tested using the new procedure, the result were a rating of 505hp from its 7.0-liter powerplant. In the case of the Cadillac STS-V, the SAE results topped GM's estimated figure of 440hp, with ratings of 469hp at 6,400 rpm and 439ft/lbs of torque at 3,900 rpm.

2006 STS-V Reaches New Performance Level [Dubspeed Racing]

Cadillac STS-V: Closer Still to the Autobahn [internal]