Etune Audio Plus

Just picked up my new '15 TRD Sport last night, and had a question about the stereo. Truck came with the Etune Audio Plus...no JBL or Nav. I am surprised the stock system sounds pretty good (for stock). My question is, can I add my previous equipment (amp, sub, and speakers) from my last Tacoma, keeping the current head unit, or would that just be a waste of time. Also, does anyone know if the difference in the JBL and non JBL is just the speakers, amp, and sub, or is the head unit altogether different?

Thanks

 

You mean all your aftermarket stuff? As long as your amp has speaker level inputs you can use it with the head unit. Not sure on the head unit info though

 

So I'm assuming the oem head unit has all necessary jacks and / or hook ups on it I will need