Aftermarket Headunit- How to wire in stock tweeters

I have a 2010 chevy Aveo with the stock head unit with the rear, door, and tweeters in the A panels. My question is that I have a old pioneer head unit that I might put in, but it is a 50x4 outputs. If I use the stock wiring harness will the stock tweeters work or will I have to splice them in or get a seperate amp for them?

the tweeters in the a pillars and running off the door speakers. So to answer your question. yes they should still work when you hook up your head unit.