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Old 03-28-2011, 04:35 PM   #12
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

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Intakes don't really do much on these cars, not until you get into 300whp and higher.

It's not like an N/A car, where every psi you gain from the higher-flowing intake is an extra psi in the engine. The boost control system regulates the manifold pressure to stay relatively constant. All a more restrictive intake does is increase the pressure ratio for the turbo, which makes it generate more heat (most of which gets cooled back off in the intercooler). The end result is the charge air is just a couple of degrees warmer and the engine makes maybe 1 HP less (as opposed to an N/A car where the engine is now injesting air at 13 psi instead of 14 psi and you lose 7% of your power).
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