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My old man had a GU scoop on his 87 Rangie, it did not make any difference to engine performance. It looked great and let heaps of dust and sand make its way into the engine bay. The amount of extra dust and dirt that made its way into the engine bay is enough for me not to do this sort of thing.
Is your engine actually getting too hot? Something I am going to do, when I get the motivation, is to create a very crude water spay system. I am going to use an old washer motor, mount the water jets on the back of the bull bar and use a blinker relay to make it spray intermitted. This should let the water actually evaporate and take heat from all of the radiators and intercooler. Switch it on when I am going up a very big hill or doing a overtake in the heat.
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