Preparing for a W4500NEX install -> a few questions

I'm getting ready to buy a W4500NEX to upgrade my 2017 SR5 Taco and have a couple questions first:

1) Would the W4500NEX sound significantly better if I replaced the speakers as well? I mostly listen to podcasts and other spoken audio and I've heard that the stock speakers don't have a good higher frequency response

2) Any need for an amp if I'm just running the stock or replacement speakers without a sub? I'm not going for volume, but clarity.

I've tried reading through this thread (https://www.tacomaworld.com/threads/premium-audio-upgrade-for-less-than-250.510424/) but it's currently 219 pages.

Thanks for any advice

 

Stock speakers are not great quality. I would replace all speakers with combatable wattage. Your deck is 50watts peak so about half that is RMS. Crutchfield great place for speakers.
https://www.pioneerelectronics.com/PUSA/Car/Fit-Guidege.

 

I'm definitely buying from Crutchfield. Might as well go all in on some speakers if I'm spending that much, I suppose.

 

I'd say, you make that decision. Get the headunit listen to the radio and see if you like it or not. I have a 4400 in mine I only did the subaru tweeter upgrade and it's been great.