Driving on 95 southbound today I had the chance to run an S4 multiple times from 60-100/105mph. We never lined up, rather we always did the chasing method. Each race I would pull away from him, not too hard or incredibly fast, but he always fell behind. One time he took the lead because I started at the extreme top of 4th, so I had to shift right away into fifth... once I did that then I started gaining on him but we had to slow before I could pass.
The S4 had a shaved rear bumper, it had metallic silver tint and it was yellow. All in all we probably ran 4 times before we got stuck in traffic and he immediatly tried to lose me.
Do these results sound typical? I dont know if he was stock or not, but I am Cobb Stage 2 (no catback).