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thi engine's exhaust sounds boring because it has "Equal length" headers unlike the WRX which has "Unequal Length headers" you will need to change headers if you want the iconic boxer sound.
for the noise you should take a video, I hope you don't have a spun bearing cuz if thats the case I wouldn't turn that car on until I had it checked. I highly doubt it but you never know. I hope your car is stock or you'll have issues with warranties.
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