I believe the torque was 205lb/ft. Not sure though. As far as the 15-20 estimate, yes that is an over-estimate. I would say 5-10hp, maybe...
I had a '96GT and did some mods. Here is the order I would recommend...
1st-Gears(3.73's 5-spd, or 4.10's Auto)
2nd-H or X pipe, off-road if possible
3rd-Pulleys
The K&N and silencer are cheap and common 1st mods, before the ones listed above. I just named the first three that I think are worth the money and made the most noticeable difference in
power.
Other good mods include:
aftermarket shifter, Cold air kit, throttle body, cat-back.
These will make a small difference(not the shifter, of course), but they add up.
Then, there is the '99 head and intake swap that's good for about 45hp, but that's about $1000 for parts. Expect at least that much for install, too.
This should get you started...
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T-Bones 1997 Cobra
Wht/blk, Pro 5.0,FRPP 4.10's, aluminum driveshaft, FRPP throttle body, C&L 80mm MAF, K&N, Steeda U/D pulleys, Steeda timing adjuster, Flowmasters, s/f connectors, FRPP pro springs, BBK caster/cambers.
