HDI airbox in a XUD ??

[devils_fuel]

How does a cone filter make it feel asthmatic?
IMO I bet you couldn't really notice the difference to what filter you fit on an XUD with a stage 1/2.

I can feel a difference with the unrestricted air filter, I'll try and explain...
I know a certain hill very well, I usually hit it at 60 and do not add any more right pedal to get to the top: -
•std airbox doing 55 at the top
•cone filter doing 50 at the top

So fitting the cone filter makes it 5mph slower at the top of this hill but generally gives it a better throttle response and the car is smoother on to boost . I'm on a mild tune and not upping the fuel to compensate for the extra air though the filter means the car is running weak, hence dying on hills. I can't be bothered to up the fuel on the Lucas so going to go back to enclosed enclose filter plus it sounds broken