I'm partial to the Crimestopper starters. I've had them in my cars for close to 15 years. I have yet to put one in a Toyota but I have done multiple Hondas and other cars. Knowing what I know now, I wouldn't run one off the OEM fob which is what I did on my daughter's Accord. As mentioned you either have to use the key to get in or shut the remote starter off first and range is awful.

I'm thinking of putting the one below in my 4runner which would allow me to use the fobs on the one I recently put in my wife's Odyssey. That one was simple because it has CAN bus but no T-harness available so a bit of hacking. I put the 2-way model in which has amazing range and you don't have to see the car to know it's running. This one will unlock the car while running even though the OEM fob will not but it unlocks all the doors.

Two bits of advice, if you can get a T-harness it saves a ton of time. Anything you have to splice into go the extra effort and solder them in, the quick connects fail after awhile.

Complete Remote Start Keyless Entry Kit For Select 2003-2009 Toyota 4Runner - MyPushcart.com

Also check out Bestbuy, they come with installation for under $300.
https://www.bestbuy.com/site/compust...98aa0449350INT