Don't install the Brant. I say this for a simple reason: They're everywhere. If you use something that is mainstream, then you'll be sure that more people know how to circumvent it. The standard "from subaru install" of a Brant was all done in the same way for huge batches of vehicles. As such, anyone who has removed one, will know either what you have to cut/connect on the main harness to bypass it, or which bits to short out on the circuit board to bypass it. Most of the time in less than 90 seconds.
I am more paranoid than most, so this bit of advice is something that some people say is over the top: Don't get a normal installer to put any security device in your car. Get a trusted friend to do it or do it yourself. If you get your anti-hijack installed at the local car stereo place, do you really know who has done it ? Do you trust their apprentice that saw your pride and joy and knows exactly how the alarm is installed ? Do you trust that the apprentice will not spout off to his mates at the pub about the awesome WRX and how he knows how to steal it ?
If you can, install it yourself. Hey, build it yourself. Start with:
Here for backlit metal keypads:
KB304-MNS-WP-B ACCORD - Keypad: universal | TME - Electronic components
Here for a hyped up 32bit 72 Mhz CPU board (Arduino compatible)
https://www.pjrc.com/store/teensy32.html
And use a LM2940C for the power supply, not that shitty LM7805 stuff.
... then in no time you will have a system that nobody has ever seen, installed or bypassed before.
Or... just get a trunk monkey
https://www.youtube.com/watch?v=AidA...3Kz_8JjLH-Nxp7