ha! I wouldn't recommend relying on the stock alarm to protect anything more than your redbull in the cup-holder. And even then you're risking it. I see the factory alarm system as just a way to keylessly lock/unlock your VX - nothing more.

Last audio setup I had the alarm was an afterthought - mostly because my VX is garaged at work and home. However, I've been reading a lot of horror stories online of those who aren't so fortunate and get their equipment jacked by some gremlins...

If you're going to spend the time, money, effort, energy, etc., into owning/installing a mobile audio system - get the best security system you can to hedge your investment. I felt sooo much better once armed properly. That way if by chance I became one of those unfortunate souls, at least I'd fell better knowing I did all I could to prevent the losses.

-biju.