Oh I see what you're saying.
I would say look for about 250 hp, and it's a Mazda, it doesn't really have a choice in handling well, it's inherent in this particular family, lol. 3's handles pretty damn well stock, and this will be upgraded, car-specific suspension just like the MSP. Handling should be amazing. As far as weight, almost identical to the 3. 100 extra pounds is all I could imagine them adding, and that will mostly be in the turbo and suspension upgrades.