First place I could find is in the area of Fox Lair Pass for SCPD and the second race "Interceptor" titled Under Pressure. You will get to pick from rapid deployment group of cars. The only coevette is the z06. You can go under your garage and see how much bounty is needed at your current bounty to unlock if you do not have it unlocked. I would try to atleast get a medal on busting the single racer. I ended with gold personally and I got the achievement once at the bounty screen. Hope this helps.