The 2021 Mazda 3's turbo engine is a more refined powerplant
The turbocharged 2.5-liter inline-four now found in the Mazda 3 (and also found under the hoods of the Mazda 6, CX-5 and CX-9) actually lags behind the old Mazdaspeed3 on horses, spitting out 250 ponies on 93 octane and 227 on regular gas.
It whips the old engine on torque, though; even on cheap fuel, it makes 310 lb-ft of twist, and you can add 10 more to that on premium. But there's no worry about that torque overwhelming the tires, because every turbo Mazda 3 is equipped with an automatic transmission packing a torque converter and all-wheel-drive.
As a result, the driving experience is entirely different than that zoomy hatch of yore. The gearbox shifts smartly when asked of it — Mazda continues to make a strong case for the argument that cars don't need more than six forward gears — but the acceleration feels smooth and forceful, not explosive.