What! a map ecu just goes "okay i'll target no.5 piston and turn it into toast" i can't even believe you wrote that. Did you not even consider that maybe the fuel injectors weren't flowing accurately or some other possible scenario? How the #$#$$# hell does a piggyback discriminate against cylinders? If it's been pushed on a dyno and had failure it just tells me it already had a weak spot.
A map ecu for a basic install uses a couple of earth wires, a power wire, one wire connects to the tacho,one goes to afm/vkf, tps (optional), and one to the oxy sensor.Now please tell me how it can possibly single out a cylinder without there already being a weak spot in the first place.
My guess is that customers are coming in with a car that's either half rooted already or has poor flowing injectors and says to the good tuner "I'd like 450 rwhp please, everyone else has it" and then the poor tuner gets stuck with a POS that is a touchy at high boost as a 100 yr old hand grenade.
Like i originally said up until you need to pull timing the map ecu can be very useful, after that go standalone.(i need a drink):aigo: