I have not dyno testes a dual snorkel to open element but I have tested a K&N six pak aircleaner element to a Fram paper element on back to back A-B-A tests on a DTS engine dyno with dual wide bans, no measureable HP or torque differences , there was a small AFR leaning out with the Fram paper element I also tested single elenent versus two elements stack on top of each other and saw a 8 hp increase with two on a 600 hp motor