[Tom Goldman]

2" is not enough . .......first thing you will notice is fuel staining on the bottom of the scoop from reversion . ...4" is minimum , more is better to allow the air flow to straighten out and minimize turbulance.
I picked up nearly 2 mph going from 2" to 5 1/2"
Accompanning pics are from a customers car but I did the same thing to a similar scoop for my car .
no one really makes a scoop that is a reasonable length for a Sportsman style car so get out the saw and the resin . ....No big deal to do .