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Holley sent us some air cleaners, but we wanted to get the most unrestricted flow possible. We settled on Holley's new Power Shot 14x3 cleaner element and baseplate with K&N's X-Stream top. The K&N 14x4 wouldn't work under the E-Body hood with the Wilson spacer. We also drilled the K&N top to work with the 5/16-inch stud size the HP-series Holleys require, and installed a longer threaded bolt to support the high-filter "sandwich."