renntech55

I was curious to know if anyone had an opinions, experience or advice on putting an after market alarm on my E55. With all the blood, sweet, and fear of it not being there when coming out to see the car is not where you parked it.( happened with my CLS 55). What would be the best way to go. Equipment and cost would be appreciated in posts. Not sure if the stock alarm does much. Thanks for the help in advance.