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If your grill is blocked, there will be less air flow in to the engine compartment to cool off the exhaust manifold. Wrap something larger around the manifold to suck the air in around.
I've done two Metros where all I did was take a 4" aluminum dryer duct, and cut a slice in the last foot of it and strapped it to the exhaust manifold. Worked great. Much faster warm-up, much smoother and peppier engine. You will notice a bit less power at WOT, mind you.
I did the math, based on the maximum air flow of the metro engine and a rough approximation of the surface area of the exhaust manifold and an typical manifold temperature and wound up with something along the lines of it being able to raise the temperature of that much air by something like 25 degrees centigrade. Most of us don't drive around at WOT, so realistically, it can warm up the air even more...Real world would be different, but the potential is there.
Found my math...31 degrees, based on a temperature difference of 500 degrees, the manifold having ~1 square foot of surface area, and the metro engine running full out...
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