Those 3.73's will make the biggest difference of everything you mentioned. My 95 GT completely "woke up" after the gear install. Not only is the car faster, but it is much easier to drive in the city. I think 2.73's are a waste the the metal there made of.
After the gears, the off road pipe will give the best increase in power (which you already have). I'd also watch the torque loss on the headers. With nothing to really restrict your exhaust (no cats, and a 2 1/2" exhaust system) you won't have very much back pressure.
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