I have a 2015 Spark LT and have had it from February 2016. I absolutely love the little thing, but I now want to start experimenting since it is out of warranty. Is it possible to put a 2014 Sonic RS engine in the car? I have spoken to a guy at a dealer near me and he said that it would be possible and that the gearbox of the Spark will also be able to handle the extra grunt, but I am not so sure about it. When swapping the engine I would probably change everything that maybe could not handle the extra power, but I just want more info on what to look out for.