In my opinion the bypass is a waste of money, but It might be necessary with the remote start. I never had mine tuned out with the engine swap on my 97 firebird, I did the "DIODE" resistor method and It's been working like a charm for 2 years now no problems whatsoever. It cost me all of .02 to do it, and about an hour of my time. I grounded the theft deterrent relay and soldered a resister in the two wires coming out of the ignition cylinder, yeah It makes it easier to steal but If they really want your vehicle there going to get it anyways.