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I have heard the y-pipe causes very little sound change. The TRD or similar cold air intake is only heard at wide open throttle.

I have the JBA cat-back exhaust. The drone is louder than the stock at normal operating speeds. I don't mind it. And no, i am not in to having a ridiculously loud exhaust at cruising speed.

With this combination, at hard throttle to say merge quickly, it is pretty loud.

My Doug Thorley y-pipe should be in on tuesday so i can tell your for sure how much it changes the sound with the current setup i have. Hope some of this helps.
 
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