Chrome or Orange?

I just bought one of these (same except black). Haven't installed it yet.....
Did you get it for the 318 you just finished up? But for the price, I like the looks of the one you bought! I think I'm going to try it also! Hopefully it will work for my 318. It says its a 4 or 5 pin replacement with no mods so I should be good right? And what does it mean when it says "min. 7500 RPM certified"??