Recently got a Civic Si sedan... I'll be doing a photoshoot with my buddy Nathan next month; will post more pictures later.
Nice looking car! Congrats. Wow my dog must be really famous and makes a great photo subject! His name is Nathan. 
LOL.
Thanks for the comments, guys.
I have yet to rev the car up as I'm still in the long process of breaking-in the car right, but there are several key differences b/w the Mazda3 and an Si.
One would be the transmission. I'm having a real difficult time shifting it smoothly.
Second would be harshness. The Si has a real-tight suspension and every bump on the road can be felt (which I don't mind).
Third... LSD! I have yet to drive the car hard, but boy, having a differential in a FWD car really helps.
I'll do a detailed comparison once the car is fully broken-in, and will expand on these three points in detail.
So far, i've noticed that the car has much less power in 4th and 5th gear than the Mazda3. But nothing that a quick rev-match downshift cannot fix.
