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Here's the best way to think about this....
Your engine is an air pump....GM did the best job they could to make good power and keep emissions in check.
Of course, the supplied power level isn't good enough...so what do we do? Add CAI and cams. Help get more air in the engine, which in turn makes more power.
But now for that air pump to work at max output, you now have a restriction in the exhaust. What do we do? Slap headers on....now the air can get out as fast as it gets in!
Great for NA, not so much for boost....the OEM backpressure helps make that 9 PSI of boost. Once the air pump becomes more efficient by adding headers, now you're losing boost pressure in the combustion chamber. What do we do then? Slap a pully on the blower to make more boost!
Bottom line? WE'RE ALL NUTS!
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