With the holdens and LS1's, OTR's or over the radiator intakes were proven to increase quarter mile times due to the air being able to 'force' into the throttle body once the car was at speed. The actual surface area of the long skinny panel filter was approx half of the original panels surface area, so I could never understand how they improved performance so much......but still bought two.
By the way those pretend intercooler air filters are for transgender's with Excel's, to go with their electronic BOV's. Get a turbo so you can have an intercooler or stay away.