Not saying your doing anything wrong. Im saying that with a bit of a ride off the line there isnt going to be to much difference. Besides if your chasing quarter mile times, why bother trying to thrash a stock wrx down the quarter?

As for the 6 speed, they are almost bullet proof. You cant even begin to compare the 5 with the 6. I never broke my box slipping it off the line, the only time it broke was once it was in gear and I dropped the hammer down then bam....stripped it clean. As teejay said be kind and they should be good for 250kw.