There is zero improvment on air flow to the intake with the FTP lenses removed (you would have to cut metal for any real help) and a decent increase in aero drag.

You might get a minor improvement of air flow if you took out the rubber gasket behind the headlight, that is mounted to the hood, but the flow through that area would not improve with removing the FTP lens.

 

I second that, I spent lots of thought on this and if you remove your FTP lenses you wont gain nothing. Even when the headlight is down and hood gasket is removed, there is some space for air to got towards the intake area, but if you ever saw FC airflow diagram you'll see that there is no pressure.

(I have it but I dont nkow how to post it)

 

this is what you want to see...


remember the further out the arrows are the lower the pressure, while the further in, the higher the pressure.

 

That won't do anything. That snorkel will only work if it's connected to a sealed airbox so air can be sucked through it. Air will not be pushed into it. Go pop you lights and have a good look in there. Then have a look in the area where the airbox was. You'll see there's no way for air to move between these areas as they're completely seperated by a steel bulkhead.