I've had my TRD exhaust for about 2 months now and I noticed it gets louder and deeper after it's driven around for about 10 minutes. Is that normal? Should I have taken more time to break it in the first day? Hope I didn't ruin anything...

 

It might not be necessarily the exhaust itself. It could be the catalytic converters coming up to temperature, which may change the exhaust tone. It might just be more noticable with the TRD exhaust opposed to the OEM exhaust.

Or I could be totally wrong and someone else could correct me. It just sounded logical.

 

I noticed mine got louder once it was warm enough to have the windows open.....
Sorry...couldn't resist that one!