Need education on amp install with stock head unit.

It's been a few decades since i did a real audio install and that was wiring everything myself. I'm looking to install an amp using factory head untit, possibly the taco tunes setup. First question... Anyone running this setup on a fifth gen? Second, with power being pulled from the battery is there any drain when the car is not running? I have a ton more questions, for sure. Not looking for the best of the best. " get the OEM plus" tracking, most likely not. Plug and play is key, but not looking to add mega bass either.

 

bump on this question.

 

Here you go! This is what I used.
https://www.tacomaworld.com/threads/tpp4s-no-nonsense-guide-to-kicker-key-t-harness-16-19.642415/

 

see this....

https://www.4runners.com/threads/whats-need-to-hook-up-amp-sub-to-head-unit.9836/#post-116243