the sports really a leisure engine...ok if you just want to bash around your backyard but if you have any racing aspirations or want to progress your driving skills then go with the race spec....if you buy the sport and then find you want to go faster you gotta buy a faster engine ....you can always run a top spec motor gently to start ..you'll have to run it in for about a gallon anyway which is plenty of time to practice your driving...then you have the power to do whatever you want...my opinion for what its worth...


ps I think the turbo head button is about 15 bucks...you only need the button not an entire head..assuming the sport version uses a separate head button that is..I've never looked ...some manufacturers use all in one cooling head/button assemblies on lower price models..