Ron is right on the rims, and there is a big difference from 96 to 97, and mainly just a minor finish difference in 97 to 98. The one BIG item that was not listed, and it is the one that probably gave pause to the rumor of 4/10ths of a second faster, is the change to a tublular header in 98. This reduced weight on the motor by 24 or 25 lbs, and there was an UNOFFICIAL , 5 hp gain. This would be a nice change, but it would not gain 4/10ths of a second. Weight loss and the mild hp gain is worth something, but it is not huge. It used to be viewed as a big improvement ,as even Viper Days added points, in their classification system , to cars that added the tubular headers on earlier cars. This lasted a short period and was thrown out, but I would think this is where some of the rumors may have surfaced.
PS - Remember the Viper addage:
96 Owners -- " This is the fastest year ever built."
97 Owners -- " This is the fastest year ever built."
98 Owners -- " This is the fastest year ever built."
99 Owners -- " This is the fastest year ever built."
00 Owners -- " This is the fastest year ever built."
01 Owners -- " This is the fastest year ever built."
02 Owners -- " This is the fastest year ever built."
So go get one and enjoy!!!