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Could be a few things. Over time, the exhaust system can change notes as certain parts get "broken in" by the heating and cooling process. Carbon buildup can also alter the sound of the exhaust by changing the relative airflow and pressure.

Also, your baby may sound a bit different because you're simply not used to it. I know the best performance mod I ever bought for my Z was my kia-beater. After driving the kia all week long, the Z feels like it gained another 100 hp!
 
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