Compustar is a good brand to go with, but check with your Infiniti dealership if installing an aftermarket alarm will void your warranty. You might have no choice but to do nothing about it to keep your warranty. Good luck!
So I borrowed a JX with premium from the dealer yesterday, and when I locked/unlocked the car using the button on the door handle it beeped - not honked. Did not try it using the FOB..... so I'm a bit confused when everyone here is saying horn only.