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If you are like me, then your memory will fool you at times, your pump might be just as loud now as when you first noticed it. If I were you I would do some datalogging to see if the pumps are doing what they need to do before replacing them.
P, especially without the cats on mine is also making noises at idle. Definitely happened after it was tuned. I think it is pumping more air/exhaust. Listen closer, is it the exhaust valve just being smacked with the exhaust at idle. That is what mine sounds like.
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