mastone - I'm not sure which reflection material you are mentioning. Im guessing its the car paint. If i do get rid of reflections, it will look CG and unreal (as seen in 1st pic here). Though I will try to use the HDRI just to light up the car without the reflections.

richand26mhz - I did try some other ones, such as night skies. It gave me same results. I even took the color of the HDRI down to darkish gray and reduced reflections(pic2). And in the last pic I used a diff hdri and allowed it to cast shadows.