Happens all the time here too. I only have a N/A but lifted trucks and ricers are a dime a dozen and all want to prove they have what it takes to do something stupid apparently. Im usually like you.... half throttle just to see what they got, keeping up with them and usually backing off the throttle around the speed limit. Occasionally Ill have a C5 or a mustang GT line up to me. Sometimes I get lucky, most of the time I dont. In any case Im off the throttle before I get to much over the speed limit, and watch them get to 100+ swerving through traffic.