To add a bit of info....
93 Cobra ran high 13's to low 14's factory stock. 5.0 in the older fox-body style. Being a 5.0, there are mods galore for this car, so it is hard to tell what you will get when you pull up beside it.
94/95 Cobra had essentially the same engine, but was heavier, and generally a low-mid 14 second car in stock form. Like the 93, it has a 5.0, and so can be mild or wild.
96-98 came with the new (at the time) 32V 305 HP 4.6L engine, and ran high 13's to mid 14's stock. The big disparity in ET is generally due to the difficulty in getting these cars launched and driven down the 1/4 mile. I had a 98, and it went 13.6 @ 104 mph in 100% bone stock trim....down to the paper air filter and original tires. However, you will also see folks muddling in the mid 14's with them....hard to launch, and hard to get a good, clean 1/2 shift.
99 Cobra's came factory with the IRS (independent rear suspension), and also came down about 20 HP off their rated 320 - some worse. Ford recalled them and replaced the intake and catback, and did a computer recalibration. The did nothing with the exhaust manifolds, as is said above. These cars are harder than 96-98's to launch (IMHO), as the IRS sucks for drag racing. It also adds about 85 lbs to the car.
However, once the recall is performed, and with gears, a few bolt-ons, and aggressive driving, they can perform quite well. Mine and a friends 99's have gone high 11's on DR's with bolt-ons and a live axle.
There were no 2000 Cobra's due to problems with the 99 (both HP rating and the IRS having vibration and wheel-hop issues). This does not include the ultra-rare 2000 R. Different animal all-together.
01 Cobra's were essentially a carry-over performance-wise, with the problems sorted out.
There is no 02 Cobra, as Ford changed a lot for the 03 Cobra (factory blower, factory T56, a few other things), and will introduce it early this coming summer.
There will also be a 03 'Mach I', that is essentially a 01 Cobra with a live axle, shaker scoop, and a few other things. A pre-production 03 Mach I went 12.97 with Nitto DR's being its only mod this past weekend at Commerce in Georgia (1000 ft above sea level...not corrected, but actual elevation).
BTW Turbojorge....may I ask what your car runs?