Undertray and Spoiler - How Necessary Are they
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The undertray and air dam help with the cooling. The air dam forces air up through the lower radiator grill. The undertray guides it to the radiator. I wouldn't leave them off on a V12. If you do, that is where the radiator won't be sufficiently cooling the coolant, leading to potential cooling problems.
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I will say the spoiler is essential for the correct look. Can't imagine how it looks without it...
I do no have the undertray, but I have made a temporary thin plywood plate supporting the spoiler at the centre, 50 cm wide. Otherwise the spoiler bends back when going +150 kmh. In a few years we can discuss if it's really temporary, but at least the plan is to make and fit a DIY undertray
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Greg in France (06-23-2018)
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