Ok so I have the '18 Touring with 6 speakers, no special package, just the base. I did swap out all 4 6X9s with Kicker CSC693 and the 2 in dash 3.5" with Kicker CSC354. the 6X9s are rated at 450W max/150RMS the 3.5s are 90/30. How do I bypass the factory amp, but keep the head unit and hook everything up with a after market amp? I will be adding 2 10s eventually, just the speakers for now. Thanks.