Factory Amp

I'm getting ready to install a small 4-channel amp and replace all the factory speakers, but keep the factory head unit. Does anyone know if the non-JBL systems have a factory amp?
 
Thanks. I had an amp in my shopping cart at Crutchfield and it was giving me a warning about a factory amp. But their information is pretty inaccurate from what I've seen. Thanks again.
 
Hopefully Toyota didn't change it up. I'm basing my answer off of a second gen. Plenty of people have swapped headunits on a 3rd gen and I saw no mention of an amp.
 
I'm getting ready to install a small 4-channel amp and replace all the factory speakers, but keep the factory head unit. Does anyone know if the non-JBL systems have a factory amp?

Did you change the speakers and keep the head unit did it work well I am thinking of doing the same and adding a small sub
 
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