That's definately a Preferred. Very very nice piece. You say you have no packaging for it huh?
I have never seen a Motorworks car close enough to see what's on the bottom, but I can't imagine it would be as detailed as this car. Can ya post some pics in the engine compartment and in the trunk area? I am curious of the level of detail there.
For what it's worth, I bought the Motorworks 1/18th scale #17 kit from Wal-Mart. If I remember correctly, there was some assembly required. These pictures look identical to my car which also has Team Caliber, Inc stamped on the chassis. The chassis is plastic and the trunk does open. The only thing I didn't like about it was the lack of tail-light decals on the back of the car, which seems to be an old Team-Caliber thing.
Is the whole chassis plastic? On the Preferreds, the chassis is metal, and the floor pan is plastic, as opposed to the Owners where the chassis and the floor pans are metal. On the Motorworks car, is the engine plumbed etc. like a preferred? Or is it like a Team Caliber Pit Stop?
On my Motorworks version, the whole chassis is plastic. The engine doesn't have any hoses or wires. The window net is hard plastic. One thing I thought was cool at the time was that the steering wheel actually turned the front tires. I ran across the 1/24 version of this same car from Motorworks a few months ago at Big Lots, it also has Team Caliber stamped on its chassis. I never made the Motorworks-Team Caliber connection before now