Bhai whatever you installed, it will create a delay.
As a rule of thumb, thieves don't have time to write a thesis on your car. They only have a minute or two, hogaya tou theek, werna phurrr....
Add some visual deterrent as well, a steering lock and alarm system... these things make your car less attractive to a thief and most probably will move on...
Definitely aftermarket devices don't work like factory fitted, but still its better to have something than nothing....