an inch is about as close as you can go, from testing ive seen and done those trumpets on the jenveys are the WRONG shape, ones like on the webers are better, ones patterned after origonal weber 40mm side draft trumpets are better still.
if it were me i would be fitting these,
http://www.emeraldm3d.com/throttle-b...th-intake.html they dont do them for 48's but the 45 ones will fit your 48's i even used a set on 50mm jenveys
if you want a set let me know and i will sort you out a more favourable price then buying direct
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