What kind of noise? Just squeal under light braking?

Mate...all good brake pads have a bit of noise... and the more you go towards a performance oriented pad the more squeal you will get, specially when cold.
STi Brembos will always squeal a little, learn to live with it...you will never get the noise free braking as when your car left the yard the first day.
Unless you get the Brembo branded ceramic pads for Subaru which is the OEM pad but they're not that great, you can find those on ebay for much cheaper than what the car yard charges if you search hard enough...but they're not performance driving pads.

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...