I run the AFE Stage II w/ Pro Gaurd 7 dry filter. Nice kit, provides lot's of air. Filter gets dirty real quick. After being educated in the 6637 and seeing it on other rigs, sure wish I would have saved the $450.00. 
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2003 F250 7.3 PSD CC SB FX4
DP Tuner F6, 160/80 Sticks, Diamond Eye 4 Inch Exhaust, AFE Stage II Intake,
DieselSite:Turbomaster Wastegate Control, AIH Delete, BRV+, Intercooler and Engine Boot Kit
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