I am new to the site, but i frequent other another mazda6 site.
I did this run last year. I ran a 13.5 @ 99 with the winter rims/tires on. My stock Speed6 tires/rims weight about 46lbs. The winter rims/tires wieght about 44.5lbs. The car is stock otherwise. I short shifted each shift and went into 5th at the end. Launching the car is similar to the wrx that i had.
http://www.youtube.com/watch?v=kMNZwBJoURs
I did this run last year. I ran a 13.5 @ 99 with the winter rims/tires on. My stock Speed6 tires/rims weight about 46lbs. The winter rims/tires wieght about 44.5lbs. The car is stock otherwise. I short shifted each shift and went into 5th at the end. Launching the car is similar to the wrx that i had.

http://www.youtube.com/watch?v=kMNZwBJoURs