Just replace the stock sweeter with an aftermarket one. It will sounds tons better and you wont have resistance issues. So you want a component speaker with separate tweeter vs a coaxial speaker with built in tweeter.
Now on my car i ran a coax speaker with a built in tweeter and didnt wire up the stock tweeter. Then iI noticed the vocals were garbage because it was at your feet so i wired in the stock tweeter. I was to say the finial load was around 6ohms which is a little lower than you want which is maybe 8 but i honestly can't remember but it ran fine on the stock HU and my aftermarket one. You might want to google it and probably find stock resistance.
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