The Busa was fuel injected and they made great strides in the late 90's in hp and drag coefficient. Everything after about 1998 is so much faster than before.I had Metzler tires rejetted the carbs and the Vance and Hines four into one header put on the bike and the ME1 rear tire was the racing compound without doing a burnout I still could not keep the front end down no matter what I tried we had a moroso motorsports Park 20 miles from home back then my best time was only 11.085. The bike could've done better. It was definitely the rider!
Hell my first street bike was a Yamaha FJ 600. I too put a Vance and Hines 4 into 1 into 2 header on it and rejetted it. I did 13.32's with it but it was falling on its face at the end of the track. Needed to rejet it again.