Tonight me and a friend decided to give it a go. We raced a few times before when I had my old engine etc, and he would pull me from a roll, he wouldn't run away but it was a brisk walk .
So we head onto I-95, I have no passengers, and he has one of our friends who weighs 195lbs. He also has an exhaust which is suposed to net him about 8whp, so nothing big.
We start the first race from a 3rd gear roll around 65mph. The passenger gives the 3..2...1 and were off. Immediately I pull him and by 4th I have a car on him. We shut down when I got into 5th and he was about a car and a half back and holding his ground. We did a few more pulls like this but from higher up, and it would be close with me pulling as the speed increased.
Then we stopped and had our friend ride with me to see what happens. This time we went from a 2nd gear roll around 40mph. We go and I get the initial surge due to my turbo being spooled. But through each gear we stayed side by side with me ever so slightly pulling.
Next time we will do the run without the difference in weight, that way we can see how it would end up. I still think I will pull him a bit, but not by a lot. When he races stock STI's, they are pretty much equal on the highway, and when I race STI's with catback and intake I pull a bit on them.
Another thing to consider, I baby my tranny, which means don't slam gears, slamming gears = very bad for AWD. He on the other hand can shift really hard because of the RWD. I need to speed up my shifting a bit, because my friend said that he was making up a little ground each time I shifted. So I must shift faster, without being too rough on the tranny.