GOING TO MAKE MY ON SNORKAL FOR T2 2.7TDI DUE TO CLOSE CALL IN VERY DEEP PUDDLE??? GOT SOME TUBE FROM B+Q AND WAS GOIN TO REMOVE AIR FILTER BOX AND PLUMB STRAIGHT IN AND PUT FILLTER ON TOP OF SNORKAL. THE TUBE IS 43MM DIAMETER WILL THIS BE BIG ENOUGH?