My SUV currently have a 7 speaker system.
2 tweeter by the wind shield, 2 fronts and 2 rears plus a small SUB that is mounted under the driver seat. (however...the low end is not good). These were all stock.

Will I really have to put in a new amp? I am really looking to just replace the speakers with current wiring if possible without going thru the whole car. Calgary summer is short here and I have tonnes of home reno projects on the go atm.

An amateur built the Ark.
Some professionals built the Titanic.
But Noah took a little advice.