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BOOST
Boost is a measurment of restriction, nothing else. By adding headers, you allow air to exit more quickly and depending on camshaft, you can see a boost level drop due to the quicker exiting air. There is less restriction on the exhaust side to hold air up as it tries to enter the chamber during overlap. On the other hand, air inlets are a restriction, hence, the reason you pick up power with a CAI. Now you are allowing more air into the supercharger and this will typically raise your boost level so ... by loosening both intake and exhaust airflow, I wouldnt expect to see a difference in boost.
Hope this helps
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