I just got a 2015 FiST with 8800km on it and I'm looking to upgrade the performance. I don't want to open up the engine and would like to stick to "bolt on's" for now. I can't rely on getting higher than 91 octane fuel where I live, so that would be the limit to the tune. I know I'm probably kicking the Hornets nest here, but I have been looking at the Cobb stage 3 power package kit and also the Mountune MR230 kit. Would love to hear comments & observations on those. I also like to know if the LSD upgrade is worth the money? So hit me with your best shot!!