thats all up to you.. it may be slow, you dont know if that was just an honest mistake, the dealerships made up for it offering to take it back.. it is a new car, you dont just slap a turbo on it and sell it like that without doing tests which is going to take more money meaning the price is still going to increase..
some people will buy it for performance, others for a daily driver, its whatever they want.. honda's are slow as fuck until you put shit on it.. why cant you do the same for the rx8 rather than eliminating it immediately just because it doesnt measure up to your expectations right off the lot.. you can easily fix all of that.. but quite possibly mazda is not directing this car, right now, toward the performance people.. seeing how it is 4 seats and 4 doors... many options and standard features that increase weight an obvious counter act for speed that im sure the engineers of this car are smart enough to notice.. with success they'll be able to make it much better as it is with other cars..