In our few laps behind the wheel of the MazdaSpeed MazdaSpeed3, we honestly couldn't feel an improvement in speed through our "butt dyno". That doesn't mean that the car isn't faster -- it's just so refined, the car still feels incredibly easy to drive. We didn't have a radar gun, nor did we time our laps, so we can't say for certain just how much faster the tuned version of the tuner car is. However, we noticed that we'd have to drive the tuned version of the car slightly differently. For example, in the standard MazdaSpeed3, we'd accelerate out of Turn 5 in Fourth gear and hold that gear all the way up to Turn 8 (the Corkscrew). Taking that same corner in the MazdaSpeed MazdaSpeed3, we'd be going so fast we'd need to shift to Fifth Gear before we hit Turn 6. We noticed a few other corners where the "fast" MazdaSpeed3 would require us to grab extra gear that we couldn't hit in the "standard" MazdaSpeed3, so we feel it's safe to say that the Mazda-tuned version of the car is faster than the already-fast hot hatch. Not bad for a factory-tuning effort that comes with a full factory warranty.