What will make my 98 gt faster than 98 cobra
 

What will make my 98 gt faster than a 98 cobra.

hhmmmmm,,,, nos?

i hear u can swap a straight axle into that beast.,, thats what i'd wanna do first

Not knowing what mods you have allready, I would get a set of FMS 3.73 and a 75 cheater shot of NOS. Drag Radials wouldn't hurt either.

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Black 99 GT
3.73 gears
Mac power chamber
2 chamber Flows
Mac cold air induction
steeda tri-ax
Nitto drag radials
13.62 @ 109 (using a G-tech pro)

NOS is the easiest way, followed by a blower. NA won't be easy. 90 hp is a lot.