I dont know how to fix your problem, but i can offer some advice about your exhaust being louder... If you put more air in, you are gonna get more air out. Now im sure it wont be twice as much, and im sure normally you wouldnt have twice the sound. But i think you should run with that. Meaning, check your o2 sensors, have you run the computer codes yet? If not you should, it will tell alot.
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