Neither - all reverse cone design airfilters are crappy. Dyno test on the Duratec have proved this.

A regular K&N pod works best. The one you want is an RU-3530


2000 SVT Turbo 295hp/269ftlb@12psi #1 for Bendix Brakes Kits! Knuckles rebuilt w/new bearings $55 AUSSIE ENDLINKS $70 Gutted pre-cats $80/set A lack of planning on your part does not constitute an emergency on mine!