I went to the dyno few weeks ago and still didn't get the car tuned but that is the different story.
My question is about the cel fix. I put it on like 4000 miles ago and no cel since that day, but now i'm thinking that befor i dyno the car maybe i should take it out. Will it give bad readnigs for the tuner to car properly. I'm n/a btw

 

My guess is, you'll end up with a CEL and you'll be running in safety mode. You should be fine with the anti-fouler in there.