$1,500 to spend
 

What mods would give me the most horsepower with $1,500 to spend.

What year GT?

It's a 2001 GT.

NOS.
Otherwise continue to save and buy a Supercharger. Vortech or Procharger.

Granted it doesn't give you hp but change out the rear gears if you haven't yet. Is it a 5speed or auto? Go with about 3.73s or 4.10s respectively. If 5 speed get an aftermarket shifter such as the Steeda tri-ax. If auto get a shift kit and possibly a better torque converter (somebody else can probably help ya there).

If it's just strictly hp you are wanting then NOS and underdrive pullies and a Steeda timing adjuster are in your current range.

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1994 Red SVT Lightning #2019 <FOR SALE>