We have been trying out various velocity stacks and venturi's in our testing and using a bellmouth really would help flow into the box! if you core saw a 3inch hole in the bottom of the box(check for clearances) then go to the hardware store and buy 3 inch diameter pvc now cut approx a 4 inch length of pvc and heat it up(heat gun-strong hair dryer) now press the heated side down onto a funnel so it spreads out and creates a bellmouth! fit the bellmouthed pvc into the airbox(you may need to sand the core sawed area to fit) trying to face the bellmouth towards the front of the vehicle to pick up pressure..using JB weld bond the bellmouth PVC into the airbox and try to smooth it in so their aren't any edges...after it dries you can also sand and contour the area! You may in fact have to cut approx an inch off the aluminum tube of the Sflo to make more room to do this modification, but that's easy enough! good luck