Yesterday hwy 18 was getting the special love from WSP. There was an early 2000's white Tahoe with no marks which wasn't totally inconspicuous and also a standard marked car. I went through all of that with no issues and was close to Tiger Mountain when I saw a car pull out ahead from the side of the road. I got a little closer and I could see it was a Charger so I figured that was another trooper. I had a guy in a cheesy slammed Nissan pacing me in my blind spot, so I assumed he was eyeing the car too. As we got into the 55 zone heading up Tiger Mt. we kept getting closer to the Charger. I could see black wheels which usually marks the undercover cars but it looked like he had a dealer plate bezel. We pulled a little closer and sure enough it had an Enumclaw dealer plate bezel and radio station and other assorted stickers on the back window and bumper. Both the guy and I made the call at the same time that it wasn't a cop. I downshifted to get by the Nissan next to me and haul ass, but he got on it hard and blew by both me and the Charger. The Charger lit him up and pulled over. I dodged a bullet. I know this is for "aggressive driving enforcement", but with the number of these stealth rigs out there now it sure seems more like just a revenue grab. Imagine that.