I'd stick with the OEM one if i were you. Get yourself a Silicone Intake + CAI. This way you'll get to keep your fuel economy, won't get a heap of popping, won't run rich between changes and still have a pshht noise.

If you must though, Go a hybrid valve. Half vent/Half recirc .. Something along the lines of a GFB WRX Hybrid, can fit one in 15 mins.

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Should have bought an STI