how do i know wut disc i have on my fmu im loooki at it rite now its chrome plate

 

i couldn't tell either on my also black fmu...that's why i threw it out for the Vafc hack.

 

what's the part # on the bottom?

 

In general, now this is true for 80% of the setups out there, the blue FMU from Vortech is a 12:1 disc installed at the factory and the Black FMU has a 10:1 disc installed at the factory. Now that doesn't mean someone couldn't open the FMU and put something else in there, but in general, blue=12:1 and black=10:1

Randy

 

I don't know about the black ones but if you go and order one from Vortech they are all blue, doesn't matter what ratio you order.