I see a lot of questions about this being done and myself had to search high and low all over the internet to get some answers for myself so I'm posting this for others who wish to do extensive stereo installs into the V as there is a lot of missing information out there. System specs speakers Dash speakers Infinity REF-3032cfx dash speaker cable adapters can be found on amazon look for RED WOLF Car Front Center Dash Pro Tweeter Audio Speaker Wiring Harness Replacement for 2012-2019 Toyota Corolla, 2008-2019 Toyota Highlander, Subaru 2012-2020 Factory Speaker Connector 1 Pair mounting is drop in, they are trapped by the top grilles but if you want to prevent some potential for rattling you can double side sticky tape the mounting tabs like i did in my picture or if you have a right angle drill you could drill new holes to mount them with two screws with more effort but its not really necessary. Front door speakers Infinity Reference 9633ix adapters are Metra 82-8146, Metra also makes adapters for 6" - 6-3/4" round speakers if you do not want to go the 6x9" route wiring adapter Metra makes one can also find on amazon it is the common two pin Toyota speaker plug i have not replaced the rear door speakers, little reason to touch them though they are still in use and much louder with an external amp setup i am running now. head unit install head unit is a Pioneer AVH-4100NEX Crutchfield's info is spot on for this and i bought everything from them for this they are only missing one adapter for sat radio if you care to keep it Metra 40-LX11 Antenna Adapter Metra 95-8243B Dash Kit Metra AX-TOYUSB USB Port Cable iDatalink Maestro RR Interface Module iDatalink HRN-RR-TO2 Factory Integration Adapter (ADS-MRR module also required) iDatalink's instructions state you need to splice wires to retain the factory backup camera but that was not the case the HRN-RR-TO2 came with the proper backup camera harness and i followed their directions ignoring the splicing and backup camera functions perfectly. if you wish to retain sat radio nobody says this is the correct antenna adapter but i have bought it and tested it and it works perfectly iDatalink ACC-SAT-TO1 sTO1 that being said I had already ran the sirius xm connect modules antenna and it outperforms the stock antenna so I most likely will switch back to using the sirius xm connect magnetic antenna. only loss is the factory microphone there is no adapter for this but others on here have detailed how you could re-wire an aftermarket into the car if you wish but i decided for now to just use the HU's dash mic placed at the top left of the center vents above the power button etc. rest of my system is just two JL amps and two 12" subs easy install in the trunk amps mounted above the spare tire with enough cable slack to allow me to easily lift them out of the way to get the spare out. I was easily able to route 6x RCA cables, 9x 18 awg speaker + amp remote power on cable and the sat antenna cable along the passenger side of the car along the door sills its tight but there is enough room and zero engine noise/ interference etc. all in all as easy of an install as it was in my 2nd gen and it sounds great.