yes, viper is a very good system
just make sure you get one of the higher end ones
viper, python, clifford, and some others
are all made by directed electronics
i had a cheapo $99 viper on my car about a week ago, then i got a higher end, mile range, remote start clifford
i love it
mine also has a TT mode, but i have no turbo, so i have no use for it, even though it is hooked up
you can change the intervals of it, but you just have to do a sequence of things with your doors/brakes/valet button and it will leave the car running for however long you set it
check with your local audio stores and see if they will install it for you
i personally tell everyone never to have best buy or circuit city do your stuff
just because the people at audio stores tend to know more about audio and security
