You'll get a better sound, but don't look for any horses...
I don't have much info on the 3.8l, but just the mufflers won't give you much (if any). I also haven't seen any numbers with after market headers and cats, just beware of the torque monster, as he loves to eat up torque in lower output engines when folks open the exhaust too much...
A better mod might be to get some after-market gears, although I don't know what the best ratio might be for you...
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98 GT
Dyno-Max cat-back exhaust, 3.73 gears, Steeda shifter, Ford Motorsport Underdrive pullies, 87mm MAF and Roush cold air kit...
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