You don't need a cold air intake.
The gain from a standard intake to a cold air, are marginal, at best.
You gain, maybe, a few horsepower, at a peak rpm. But none at the rest. And sometimes, even lose horsepower.
Search for yourself, if you want. Importtuner.com has a few power pages, about the WRX, but it's pretty common. Gain some horsepower, lose some torque. Gain top end, lose acceleration.
Don't bother.
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