I own a silver 2004 Mustang Cobra that is making 420 rwhp on a mustang dyno that the shop owner claims rates the Mustangs/Lightnings he puts on it between 20-25% lower then a dyno-jet. Before I list my mods and question I have to let you know that I have very little knowlege of cars and thier modifications. I have been trying to learn as much as I can from other cobra owners. The mods I have are 2.5 exhaust with catback, CCI, pro 5.0 shifter, SCT chip, Stieg. ported eaton with upgraded upper pulley, lower pulley, and throttle body, 101 octane fuel (Torco) with a tune for it (i have a switch that changes my chip settings for when I am just running 91 octane which is our highest pump in az, or when I run 101 octane), and 315 nitto drag radials on the rears. What should I do next?? I am currently saving up for a whipple but I want to add some other mods while Im saving. I have been told to do either headers or a cooling system. Anyone have any other ideas? I have not done anything for the suspension yet, should I do something there first? Any an all ideas would be appreciated. I will post pics of my ride as soon as I get it back, im getting a new clutch.