Ah oo nabalitaan ko nga rin yan, sinisira yung starter. Pag inalarm mo, di na gagana yung starter kahit nasa loob ka pa ng sasakyan.

Kidding aside, there's no such claim that an alarm can wreck havoc inside your engine bay. If there was any, its probably an urban legend. :D

Any alarm will do if you only want simple security such as central locking and shock vibrations.