Create a new Group, and a new layer. Make a selection, to the main part of intercooler, and fill it with #0B0B0B colour. Then go to Filter > Noise > Add noise.

Create a new layer, and having the Brush Tool at 3px size, take Pen Tool, and following the initial shape, make a line path. Then stroke it with #808080 colour. Duplicate the layer how many times is need, to fill the intercooler, with these lines. But, always follow the initial shape.

Duplicate the layer with the lines, and go to Image > Adjustments> Hue/ Saturation and set the Lightness +100. Then take the Erase Tool, set it opacity at 50% and erase in the center, and in the borders of lines.

Make a new layer, make a path, following the shape, to separate the exterior parts of the main intercooler. First on the right side or on the left. So, take Pen Tool, make a path, and then, having the Brush Tool at 2px size and black colour, stroke it. Immediately, make a new layer and using the same path, stroke it with white colour. Then, move the last layer, with white colour next to the black, but external. Set the layer's mode to Overlay. Take Erase Tool, and a big brush, 65px size, and erase a bit the top of this layer, there where are the shadows. After that, do the same procedure to the other side.
