Look at
www.saleen.com and look at the specs on the vehicles. The 281 isn't much faster but the S-281 is signifcantly faster with the "S" meaning supercharged. The specs are for the 2000 Saleen but the mods are pretty close to the same as they used in 96-98 with only a few changes to the mods. Saleen's site is dope anyways so look around, especially at the S351's and the new S7.