Dyno testing has shown the EGR intakes, even the ones with the squared off secondaries don't lose much in a typical street engine to the earlier intakes. They're a lot heavier though, and if you're upping the RPM potential of the engine or running a big cube engine then something with a larger plenum would probably be better.
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'72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car!
'73 Firebird 350/4-speed Black on Black, mix & match.
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