engine bay colors, which black? semi, gloss, flat

[almcbri]

I really like this flat color that DSE used on Stuarts Camaro, If anyone has any idea what color they use, please let me know. http://www.detroitspeed.com/projectp...artbc_main.htm

Another question: I have already painted my firewall and all the other pieces a single stage gloss black. I like the way it looks, but it just looks a little too shiny for my personal taste. What do I need to do to be able to re-shoot the firewall, and parts again with a more flat black color? Can I just wet sand it and shoot over it, or what would I be better off doing?

Hopefully some of you painting pros can chime in and help me out. The car is finally taking back off. I am on fall break in college so I hope to knock out some work this week as well.