This is a good question havent tried that yet. all I know is that you need to unbolt the subframe and tilt it back a bit to get the tunnel to fit. do you remember were you read that info on the Preditor?

 

I didn't read about the predator, a friend of mine has a predator and bought the CFM airbox for it earlier this year, and he told me about the dyno testing that he had read about since then and asked me if he could have my old DS intake boot after I bought the newer improved and stiffer one from the dealership a while back. But he hasn't personally tried retrofitting the boot to his predator yet.