I have a Vortech FMU(12:1 i think) and an inline pump. If I put some 450cc's on with a VAFC to controll them, do I HAVE to take the FMU off, or can I leave it on? Will it screw with my settings for the VAFC?

Basically, if i do 450cc and VAFC, is it ok to leave the FMU on?

 

remove fmu

 

Yes remove that thing. Unless it's a 1:1 it is going to cause you problems. Way too much fuel to start out with.
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Since it was already on the car to begin with, is it hard to take off?

 

no just unscrew it, and remove the lines, and plug them up at the tees. you would be running wayyyyy to rich.