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You want 'neither' or 'either' of the piggybacks?
If you want 'neither', don't waste your time looking into this topic. It gives no benefit to your option because you are having no options.
However, can you let us know, what car are you driving? Some cars/model are not compatible with e-manage but it's alright with safc or many other piggyback in the market.
To you questions:
E-Manage settings WILL NOT BE LOST even if you took it out of the car and have the wires disconnected. (I thought I've make this clear a few times back but this same question still arise).
E-Manage WILL NOT DESTROY YOUR ECU unless you wired it wrongly and monkey around with something you don't understand or being installed by your 'friend' who have no knowledge to fix this unit but just trying around.
If you have no confident that these gadgets will do the stuff, stay away and you should have a peace of mind. There are thousands of cars around the world that uses piggybacks without issues and there are also some that have lots of issues. You should have guts to try something new...
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