How much does adding a front air dam / valance help? Especially on ITB, C and A cars, I've always viewed this as an item more for show.

Now that it is winter and I'll have some time on my hands, maybe it would be worth spending some time to add one. What cheap and fairly easy methods have you used or seen that work well. (I'm basically looking for a Home Depot solution. I do not weld nor want to pay someone to weld one up for me.) I've seen some people use the bed landscaping plastic stuff, but am not so sure about that. I'm also planning on adding brake ducts and would most likely cut holes in the air dam for this purpose.

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Dave Gran
NER ITB #13
'87 Honda Prelude si