YoSpeed - Engraved Battery Tie Downs

I've never taken a close look at 350z gas covers, but I'm assuming they're cast aluminum.

Like I said in the thread, we use 6061-T6 aluminum which we machine on a CNC mill or lathe depending on the shape of the product. If you're talking about looks, it will look pretty much the same. 6061-T6 looks better than pretty much any other quality aluminum when it's brushed or un-painted because it's one of the higher grades. It's actually much stronger than what you'd need for decorative purposes. The only other grade aluminum that is commonly used is 7075, which is also use on aircraft components. 7075 has a higher tensile strength, but is going a little overboard for battery ties. I doubt you'd need 78,000 psi tensile strength for something that keeps a battery from moving around inside an engine bay.