questions
 

05 v6 accord vs manual rx-8 (both stock), who wud win? (straightline)
and anyone know much about this: http://www.i-m-racing.com/grtukitt6rxs.html, like how much hp/torque increase?

Go to the major horsepower upgrades there's a huge thread on the turbo kit.

As far as the accord, figure it out for yourself.
www.car-stats.com
BTW drag racing is ghey.

The accord will win if its the 6 speed.

If you are more concerned about the straight line acceleration and don't care about the handling differences between a FWD family sedan (and I include the Coupe in that labelling) and a RWD sports coupe, then just buy the Accord and be done with it.

Regards,
Gordon