These louvers are on Xnowyte. They are polished stainless steel(might make them satin though) marine units. They are designed for engine bay heat removal on boats. I placed the drivers side above the manifold so that when I take it offroading the heat will simply rise. The low speeds do not allow for rapid engine heat evacuation via a more forced method. In a high speed application I would simply be concerend with air coming out of the radiator and use another method for engine bay heat extraction, as I did on the Warrior. The passenger side helps to cool things up as well, but its more for keeping symmetry than anything else.
XJguy

XJguy