Attached Link: http://www.doschdesign.com/products/hdri/Extreme_Hires_DVD.html

Not sure what you mean by 'warped". Do you mean they curve away from the camera? A lot of HDRI scenes that you place your model into are like panorama images- so maybe that's what you're seeing. The link is to the Dosch site where they sell hi-rez HDR's to place your model (like a car) into the scene. You can see that some of these exhibit camera lens curvature...