Super Jet 2 screw vs 3 screw FP headpipe

[jetx]

Anyoen know the main advantages/disadvantages between the 2 screw FP head pipes and the 3 screw Fp headpipes?

I know what the 3 screw headpipes adjustability can control. What about the 2 screw?

 

[chriselmore_1]

welll... Most people unly have 1 screw open anyways... But the meadpipe/mani bore diameter is smaller on the older bpipes

 

[Freakrider]

Chucky at XScream recommends to run just the middle screw open because if the top screw is open it facilitates moisture pulled into the motor. So not having the third bottom screw does not matter IMO because it would be closed anyways. The 2 screw headpipe/manifold might need bored out depending on what performance engine you are running...