The front dash speakers are 3.5" and pretty much any 3.5 coaxial with no more than about 17mm mounting height will fit easily. Mine are 19mm and that is about the limit. You can also consider using a wide-band 3.5" speaker from Dayton.
The doors have built in 6x9 speaker enclosures. If you get a component system you should plan on sealing up the enclosures pretty well. I know a lot of people like to use component with passive crossovers, but honestly I don't think it sounds as good for the following reason. Most of your stereo image starts with frequencies around 400 Hz on up. That's the bottom end of the human voice. So your leg and that of any passengers is essentially blocking any sound that your ears use to localize an image. Component tweeters don't start until about 3000Hz, which is pretty high. You will notice most competition setups end up with a mid-range high in the door or on the A pillar. The door speakers should really only play up to around 200-400 Hz. Even though I have coaxial's in the doors, I am using a DSP and they are only playing 70Hz to 350Hz. My sub plays below that, and the dash plays above. Just enough to give the mid-bass punch that feels good. After that the image is up at the windshield across the dash and the image is very sharp and clear. JL C2 6x9 or the C3/C5 coaxial 6x8's can accomplish that for the same price.
The PAC adapter, if it is the C2A-CHY5 has pros and cons. Although you get a low level signal for your amps, I find it a little nosy and I have read others stating that as well. It does odd things like at one volume setting it will pick up some noise, but dial up or down a step and background goes completely silent It is inherent in the electronics that are also trying to read the CAN Bus signal. The alternative is the Audio Control LC6i or lC7i or use direct speaker inputs. I have and LC7i sitting in my garage because I have been debating trying that out instead. That will preserve more of your head unit features like EQ, but has the issue of pulling a signal that has been EQ'd and crossed over, then reassembled and crossed over and EQ'd again. If you have ever converted an image from a .tiff to a .jpg to a .tiff again, you get the idea of what that does to the sound. With speaker level input, you are stuck with whatever signal you have.
Your whole system is maxed at 120-130 Amps so I am not sure you really need the cap. Most people on other forums think it isn't necessary. You can wait to see if your headlights dim but the alternator is 180 amps. The HD is a Class D amp and is efficient.
What you don't have on that list is a DSP for EQ and time alignment. You will have the capacity for a lot of SPL, but nothing makes a system sound good like tuning. Anywhere near the RMS abilities of what you have listed will make you deaf. If you are a DIY type of person, think about adding miniDSP's to your system. High quality components and very cheap. Otherwise, the RF 360.3, Alpine PXA H800 or the JBL MS8 might work and have simple setup interfaces.
Not sure about the NAV issue. I don't have that with my 8.4 Uconnect.
The doors have built in 6x9 speaker enclosures. If you get a component system you should plan on sealing up the enclosures pretty well. I know a lot of people like to use component with passive crossovers, but honestly I don't think it sounds as good for the following reason. Most of your stereo image starts with frequencies around 400 Hz on up. That's the bottom end of the human voice. So your leg and that of any passengers is essentially blocking any sound that your ears use to localize an image. Component tweeters don't start until about 3000Hz, which is pretty high. You will notice most competition setups end up with a mid-range high in the door or on the A pillar. The door speakers should really only play up to around 200-400 Hz. Even though I have coaxial's in the doors, I am using a DSP and they are only playing 70Hz to 350Hz. My sub plays below that, and the dash plays above. Just enough to give the mid-bass punch that feels good. After that the image is up at the windshield across the dash and the image is very sharp and clear. JL C2 6x9 or the C3/C5 coaxial 6x8's can accomplish that for the same price.
The PAC adapter, if it is the C2A-CHY5 has pros and cons. Although you get a low level signal for your amps, I find it a little nosy and I have read others stating that as well. It does odd things like at one volume setting it will pick up some noise, but dial up or down a step and background goes completely silent It is inherent in the electronics that are also trying to read the CAN Bus signal. The alternative is the Audio Control LC6i or lC7i or use direct speaker inputs. I have and LC7i sitting in my garage because I have been debating trying that out instead. That will preserve more of your head unit features like EQ, but has the issue of pulling a signal that has been EQ'd and crossed over, then reassembled and crossed over and EQ'd again. If you have ever converted an image from a .tiff to a .jpg to a .tiff again, you get the idea of what that does to the sound. With speaker level input, you are stuck with whatever signal you have.
Your whole system is maxed at 120-130 Amps so I am not sure you really need the cap. Most people on other forums think it isn't necessary. You can wait to see if your headlights dim but the alternator is 180 amps. The HD is a Class D amp and is efficient.
What you don't have on that list is a DSP for EQ and time alignment. You will have the capacity for a lot of SPL, but nothing makes a system sound good like tuning. Anywhere near the RMS abilities of what you have listed will make you deaf. If you are a DIY type of person, think about adding miniDSP's to your system. High quality components and very cheap. Otherwise, the RF 360.3, Alpine PXA H800 or the JBL MS8 might work and have simple setup interfaces.
Not sure about the NAV issue. I don't have that with my 8.4 Uconnect.