Locally, I have a couple guys starting to run the 1/8 mile with thier connies. Chris Gray, in this second time on a dragstrip, posted a 7.03 / 104 with a c-14 outfitted with a 2 BR slip on and Shoodaben flash. He just last week installed a full Area P system, and the attending flash, and that night ran a 6.81 @ 107.48 . He was also afraid of looking the bike on the launch, and shortshifted 1-2 because of the wheelies he'd already fought. I have another customer who is installing the AreaP pipe now and he has experience drag racing. He weighs the same as Chris, so it's going to be interesting. I honestly think a good rider will get into the high 6.6's with that setup.
ETA - I'm not posting this ^ as an advertisement. If you're talking racing (times, mph) the comparisons are only relevant if you know what mods are done to the vehicle.
Steve