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OK I'll jump in the fray here.
And the answer to the "just bolt on a blower to a viper" isn't quite that simple.
The compression ratio is so high in the viper that you might be able to run 4 pounds of boost. for about 10% to 20% gain. So lets say its 20% for a grand total of 750HP approx. A blower for the Viper is gonna run about 10K if we are lucky.
Meanwhile, the ZR1 is already a blown motor that is more than capable of handling near 20lbs of boost. For about, meh, 100 bucks. Now the ZR1 is well into the 800hp range.
That's the problem with NA. It is allready maxed out. Where as the LS9 begs for more boost. GM just doesn't need more. But there is plenty room to grow. Room that you don't have on a NA high CR engine. GM already learned this lesson with the LS7.
FWIW.
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