wow, I can't believe how much bad information is being said in this post
first, yes, the aftermarket disables the OEM security....for 3 seconds to allow for start, then re-arms the factory alarm. 2nd, you cant steal a car that has been remote started, as you still need the key to unlock the steering, and as soon as you put your foot on the brake the starter is disabled, and it is back to OEM security. Barely any cars need the "key in the box" bypass, so there will be no key left in the car.
as for install, in newer cars, it is actually quite easy. An immobilizer bypass on any car with "CAN" is simple, on most cars it was is about 6-15 wires that had to be spliced and soldered. There are even t-harnesses available for both DEI and Compustar.
also, your warranty can not be totally voided for a remote start. In my 16 years as an installer, I have never scene anyone's engine blow up to an aftermarket remote starter. They would have a hard time under the moss-magnuson act trying to pull that . They would have to determine that any aftermarket part was the root cause of the failure.....and unless the remote start was done by johnny chimpo, you should have no problems, and if there are, any reputable shop will take care of that for you.
also, on my ridge, I have a viper 5904, with a DBALL2 bypass. (I had Honda make me a valet key so I didn't have the big OEM fob/key and the viper) It was 10 wires and you are done. 9 of the 10 wires are in the steering column, the last is at the fuse box. I have helped quite a few members on this board with RS. I can send you wiring diagrams, and answer just about any question you may have on them.