As you know most people here will praise the piggyback but I'd save my money if I were you. I can promise you an actually tuned elantra turbo with bolt ons will instantly gap an identical car with the same bolt ons and a bluespark module. All it does is 'trick' your ecu's fuel and boost readings by intercepting the actual data and sending different values to the ecu. If you want cheap 'power', go for it. If you get mods like DP and FMIC, bluespark won't be able to adjust cam/ignition timing or AFR so it by itself won't be able to make any better adjustments than your standard ecu itself would. If you care about your car running properly while you get the bolt ons you want, just focus on those and wait for an actual tune. I know it's not what you wanted to hear, but it's the truth I had to experience myself when I sought the module as something to increase power before I got a proper tune.