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Don't know offhand but try looking it up on oemacuraparts.com. Excellent searchability and decent prices on parts. If too expensive there try a junk yard. Good luck bro.
It's called a "Lower Engine Cover". The part number is 74114-SEP-A00. The metal part that's bent is a brace that stiffens it. If you lost the front bolt that holds it up, it is a 10mm bolt. There are two bolts, one at the front and one at the rear. There are also about 5 or 6 of the push clips that help hold it up. You can find them from time to time on Ebay, at a junk yard, or buy new from one of the online Acura part vendors for about $85 plus shipping.