Hello guys, I had 03 G500 I want to upgrade the stereo and amp change all speaker, anybody experience with that? I'm afraid to cut the wire after the original amp and connect to new amp and out to speaker, any problem with the original head unit? will it work? I want to keep the original head unit just add amp and new speaker....please help commond Thanks

 

I started with a sub and amp which really helped. Infiniti.